StarTech.com Universal Laptop Docking Station, Hybrid USB-C & USB-A Dock, Dual 4K DP & HDMI, 60W PD, Mac / Windows / Chrome OS, 4x USB 5Gbps Hub, GbE

£96.85 £80.71
StarTech.com Universal Laptop Docking Station, Hybrid USB-C/USB-A Dock, Dual 4K DP/HDMI, 60W PD, Mac/Windows/Chrome OS, NIC
  • HYBRID DOCK: Universal docking station works with USB Type-C, Thunderbolt 3 / 4 & USB Type-A laptop computers, using a 2-in-1 USB-C / USB-A cable; Ideal for hoteling or shared workspace setup
  • DUAL DISPLAY ON MACBOOK AIR: Enable two external displays on Apple MacBook Air/Pro (base M-Series) laptops that natively only support one; DisplayPort or HDMI ports supporting up to Dual 4K 60Hz; Driver installation required on Windows and macOS
  • WORKS WITH ANY LAPTOP: Simplify your deployment with a USB-IF, VESA & DisplayLink certified docking station that offers optimal performance and universal compatibility with any laptop (Windows, macOS and Ubuntu) or Chromebook (ChromeOS)
  • FULL-FEATURED DOCK: 4-Port USB 5Gbps Hub (2x Fast Charge) with 1x USB-C and 3x USB-A, Gigabit Ethernet & 1x 3.5mm audio/headset, K-slot for security lock & holes for optional mounting bracket; Includes DisplayLink Update Utility; 60W power delivery
  • IT-PRO ADVANTAGES: Included connectivity tools for IT Pros and IT help-desk support teams with Network MAC Address Pass-Through for network security, WiFi Auto Switching for improved network performance, USB Event Monitoring, and Windows Layout

More Information

More Information
Product colour Black,Grey
SKU DK30C2DPPDUE
EAN 0065030879965
Manufacturer StarTech.com
Availability Y
Product Manuals (HTML) View Manual
View Manual
View Manual
View Manual
PDF URLs View PDF
View PDF

Description

Dual 4K60 | DisplayPort and/or HDMI | USB-IF Certified | 3x USB-A | 1x USB-C | Mac, Windows® & Chrome OS™ | Lock Slot

Create a dual-4K 60Hz workstation with this certified universal laptop docking station for USB-C and USB-A laptops. The USB-C dock features 60W Power Delivery 3.0, dual HDMI and/or DisplayPort monitors, fast-charge, and both USB-C and USB-A peripheral ports.

The Uniquely Universal Host Cable

The USB-C dock comes with a universal host cable that is designed with an attached USB-C to USB-A adapter to accommodate USB-A laptops. The cable also features an extended length of 1 meter (3.3 ft.) to support a wide variety of workstation setups. Replacement host cables or extra host cables can be purchased separately here.

Flexible Monitor Connections

This is a dual 4K60Hz video docking station with support for both Ultra HD DisplayPort and/or HDMI monitors that lets you configure your video connections to best suit your needs.



Dual 4K DisplayPort | Up to 4096 x 2160p @ 60Hz



Dual 4K HDMI | Up to 4096 x 2160p @ 60Hz



Single 4K DisplayPort + Single 4K HDMI | Up to 4096 x 2160p @ 60Hz



Single 5K DisplayPort * | Up to 5120 × 2880

*Requires monitor support for 5K using two DP ports

Certified for Universal Compatibility & Reliability

This docking station is fully certified to meet top industry standards for USB-IF (USB 3.1 Gen 1, USB Type-C and Power Delivery), VESA DisplayPort and DisplayLink (video connections) certification to guarantee the highest quality, reliability, and compatibility.

60W Power Delivery

Using a single cable, the dock powers and charges your laptop as you work with 60W PD for faster charging, using the 135W power adapter.

Easy and Convenient Setup

For fast setup right out of the box, the combo cable (USB-C with attached USB-A adapter) lets you connect any laptop. The dock has mounting holes for workstation mounting (bracket not included).

The Connections You Need

Connect your devices with four USB 3.1 ports: 1x USB-C and 3x USB-A. Fast-charge your USB-C or USB-A smartphone. The dock provides a GbE port (PXE Boot support & Wake-on-LAN) and 3.5 mm 4-position headset audio jack. It also includes a security lock slot (K-slot) to protect against theft.

For more installation flexibility, you can use StarTech.com mounting brackets (SSPMSUDWM& SSPMSVESA) that are specifically designed for our docks and hubs, to mount your dock to a desk, wall, or other surfaces to give you the customized setup you need.

Enhance Productivity and Device Management with the StarTech.com Connectivity Tools Application

Developed to improve performance and security, StarTech.com Connectivity Tools is the only software suite on the market that works with a wide range of IT connectivity accessories. The software suite includes:



Advanced Windows Layout Utility : To setup and save custom windows layouts.



Mac Address Pass-Through Utility : To improve network security.



USB Event Monitoring Utility : To track and log connected USB devices



Wi-Fi Auto Switch Utility : Enabling users to quickly access faster network speeds via wired LAN.

For more information and to download the StarTech.com Connectivity Tools application, please visit: www.StarTech.com/Connectivity-Tools
The IT Pro's Choice Since 1985

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.

DK30C2DPPDUE is backed by a StarTech.com 3-year warranty and free lifetime technical support.

The StarTech.com Advantage

Specifications

Ports & interfaces
Combo headphone/mic portYes
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity3
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity1
Headphone connectivity3.5 mm
Host interfaceUSB 3.2 Gen 1 (3.1 Gen 1) Type-C
USB 2.0 ports quantity0
Ethernet LAN (RJ-45) ports1
HDMI ports quantity2
DisplayPorts quantity2
Headphone outputs1
DC-in jackYes
Connectivity technologyWired
USB Power Delivery (USB PD)Yes
USB Power Delivery up to60 W
Network
Full duplexYes
Networking standardsIEEE 802.3, IEEE 802.3ab, IEEE 802.3u
Ethernet LANYes
Ethernet LAN (RJ-45) ports1
10G supportNo
Performance
UASP supportYes
Maximum digital resolution5120 x 2880 pixels
Full duplexYes
Product colourBlack, Grey
Card reader integratedNo
Cable lock slotYes
Data transfer rate5 Gbit/s
CertificationCE, FCC, REACH
Cable lock slot typeKensington
Housing materialPlastic
Technical details
Product colourBlack, Grey
Cable lock slotYes
Data transfer rate5 Gbit/s
Harmonized System (HS) code84733020
Compliance certificatesRoHS
Products per master (outer) case6 pc(s)
Master (outer) case width295 mm
Master (outer) case length500 mm
Master (outer) case height250 mm
Storage
Card reader integratedNo
Power
Input current2.5 A
Power plug typeType N
Compatible power plug typesEU, UK
AC input voltage100 - 240 V
Power consumption (typical)135 W
Output voltage20 V
Output current6.75 A
Software
Windows operating systems supportedWindows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 7 x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64, Windows 8.1, Windows 8.1 Enterprise, Windows 8.1 Enterprise x64, Windows 8.1 Pro, Windows 8.1 Pro x64, Windows 8.1 x64, Windows 95
Mac operating systems supportedMac OS X 10.11 El Capitan, Mac OS X 10.12 Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina, Mac OS X 13.0 Ventura
Mac compatibilityYes
Other operating systems supportedChromeOS
Operational conditions
Operating temperature (T-T)0 - 50 °C
Storage temperature (T-T)-20 - 70 °C
Operating relative humidity (H-H)0 - 95%
Weight & dimensions
Weight280 g
Width80 mm
Depth220 mm
Height30 mm
Package weight1.3 kg
Package width160 mm
Package depth270 mm
Package height105 mm
Design
Windows operating systems supportedWindows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 7 x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64, Windows 8.1, Windows 8.1 Enterprise, Windows 8.1 Enterprise x64, Windows 8.1 Pro, Windows 8.1 Pro x64, Windows 8.1 x64, Windows 95
Mac operating systems supportedMac OS X 10.11 El Capitan, Mac OS X 10.12 Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina, Mac OS X 13.0 Ventura
Product colourBlack, Grey
Cable lock slotYes
CertificationCE, FCC, REACH
Cable lock slot typeKensington
Packaging data
Package weight1.3 kg
Package width160 mm
Package depth270 mm
Package height105 mm
Packaging content
Quick start guideYes
Cables includedUSB Type-A to USB Type-C
AC adapter includedYes
Certificates
CertificationCE, FCC, REACH
Logistics data
Products per master (outer) case6 pc(s)
Master (outer) case width295 mm
Master (outer) case length500 mm
Master (outer) case height250 mm
Harmonized System (HS) code84733020
Other features
ChipsetDisplayLink - DL6950, Genesys Logic - GL3523, Fresco Logic - FL7102, Fresco Logic - FL7201, VIA Labs - VL160, RealTek - RTL8153, Texas Instruments - TS3A225E

Delivery Details

  • UK distributors.
  • Order before 4 pm for next-day delivery.
  • Standard (2-3 days) £7.50
  • Next Day £9.99
  • Free standard delivery over £100

There are deivery surcharges to these postcodes:

Postcode Charge
IV3-40 £20
IV52-54 £20
IV63 £20
KW1-14 £20
PA10-40 £20
PH19-40 £20
PH50 £20
HS £50
IV41-51 £50
IV55-56 £50
KA27-28 £50
KW15-17 £50
PA41-49 £50
PA60-62 £50
PA76-78 £50
PH41-44 £50
ZE £50
IM £50
JE £50
GY £50
TR21-25 £50
BT £20
Suggested Products

Hypertec ProDock EssentiaI - Universal USB-C Dock ...

Shop Now

Hypertec ProDock Essential X - Universal USB-C Doc...

Shop Now

Hypertec ProDock Mac - USB-C Dual HDMI Docking Sta...

Shop Now

StarTech.com 4K USB-C Dock , Triple UHD 4K Monitor...

Shop Now

StarTech.com USB 3.0 Docking Station - Dual Monito...

Shop Now

Lenovo 40AJ0135DK notebook dock/port replicator Do...

Shop Now

Lenovo 40AJ0135IT laptop dock/port replicator Dock...

Shop Now

Lenovo ThinkPad Ultra Docking Black

Shop Now

DELL DA300 Wired USB 3.2 Gen 2 (3.1 Gen 2) Type-C ...

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Lenovo 40AN0135UK laptop dock/port replicator Wire...

Shop Now

StarTech.com 4K USB-C Dock, Triple UHD 4K Monitor ...

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Targus DOCK430EUZ laptop dock/port replicator Wire...

Shop Now

ALOGIC DUTHD laptop dock/port replicator USB 3.2 G...

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Microsoft 1E4-00004 laptop dock/port replicator Bl...

Shop Now

i-tec USB-C Dual Display Docking Station with Powe...

Shop Now

Yealink BYOD-BOX Wired Grey

Shop Now

DELL Mobile Adapter DA300 Wired USB 3.2 Gen 2 (3.1...

Shop Now

Origin Storage USB-C/A Docking Station with 85w PD...

Shop Now

ALOGIC USB-C Triple Display DP Alt. Mode Docking S...

Shop Now

HP USB-C Dock G5

Shop Now

i-tec USB-C Dual Display Docking Station with Powe...

Shop Now

i-tec USB 3.0/USB-C Dual HDMI Docking Station

Shop Now

LogiLink UA0370 notebook dock/port replicator Wire...

Shop Now

LogiLink UA0373 laptop dock/port replicator Wired ...

Shop Now

Belkin USB-C Dual Display Docking Station USB 3.2 ...

Shop Now

Microsoft 1E4-00003 laptop dock/port replicator Bl...

Shop Now

ALOGIC Bolt Plus USB-C Docking Station with stand

Shop Now

Urban Factory TCD45UF laptop dock/port replicator ...

Shop Now

ALOGIC MX3 USB-C TripleDisplay DP Alt. Mode Dockin...

Shop Now

Origin Storage USB 3.0 Universal Docking Station

Shop Now

i-tec USB-C HDMI DP Docking Station with Power Del...

Shop Now

i-tec USB-C HDMI DP Docking Station with Power Del...

Shop Now

LogiLink UA0383 laptop dock/port replicator Wired ...

Shop Now

LogiLink UA0382 laptop dock/port replicator Wired ...

Shop Now

Digitus Dual M.2 NVMe SSD Docking Station with Off...

Shop Now

Plugable Technologies 4K DisplayPort and HDMI Dual...

Shop Now

Port Designs 901906-W notebook dock/port replicato...

Shop Now

ALOGIC TB4D3TB laptop dock/port replicator Wired T...

Shop Now

2-Power DOC0117A laptop dock/port replicator Black

Shop Now

HP Universal USB-C Multiport Hub

Shop Now

Lindy DST-Pro 5K XT, USB-C Laptop Docking Station ...

Shop Now

DELL 6-in-1 USB-C Multiport Adapter - DA305

Shop Now

DELL 6-in-1 USB-C Multiport Adapter - DA305

Shop Now

HP Universal USB-C Multiport Hub

Shop Now

StarTech.com USB C Docking Station, Dual 4K 60Hz H...

Shop Now

ASUS SimPro Dock 2 Wired Thunderbolt 3 Black, Blue

Shop Now

i-tec USB 3.0 USB-C/Thunderbolt 3x Display Metal N...

Shop Now

DELL DA305 Wired USB 3.2 Gen 2 (3.1 Gen 2) Type-C ...

Shop Now

j5create JCD542-N USB-C® Dual HDMI™ Docking Sta...

Shop Now

j5create JCD401 USB4™ Dual 4K Multi-Port Hub, Si...

Shop Now

j5create JCD543P USB-C™ Triple Display Docking S...

Shop Now

i-tec USB-C HDMI Dual DP Docking Station with Powe...

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Origin Storage USB C Docking Station Black - 135W

Shop Now

Port Designs 901910W-UK laptop dock/port replicato...

Shop Now

Manhattan USB-C Dock/Hub, Ports (x10): Ethernet, H...

Shop Now

i-tec USB-C Metal Ergonomic 3x 4K Display Docking ...

Shop Now

Belkin INC014BTSGY laptop dock/port replicator Wir...

Shop Now

Plugable Technologies USB 3.0 and USB-C Dual 4K Di...

Shop Now

Plugable Technologies USB C Docking Station Dual M...

Shop Now

Plugable Technologies USB 3.0 Universal Laptop Doc...

Shop Now

StarTech.com USB-C Triple Monitor Multiport Adapte...

Shop Now

i-tec USB-C Triple Display Docking Station Gen 2 +...

Shop Now

HP USB-C/A Universal Dock G2

Shop Now

i-tec USB-C Triple Display Docking Station Gen 2 P...

Shop Now

eSTUFF GLB232003 laptop dock/port replicator Wired...

Shop Now

HP Universal USB-C Hub and Laptop Charger Combo

Shop Now

Lindy DST-Mini XT 810, USB-C Laptop Mini Docking S...

Shop Now

Origin Storage Travel Dock USB C 10in1 with dual H...

Shop Now

HP Universal USB-C Hub and Laptop Charger Combo

Shop Now

Lenovo 40B90000WW laptop dock/port replicator Wire...

Shop Now

Lenovo 40B90100UK laptop dock/port replicator Wire...

Shop Now

Belkin INC015BTSGY-CZ laptop dock/port replicator ...

Shop Now

DELL 6-in-1 USB-C Multiport Adapter - DA305

Shop Now

Manhattan USB-C Dock/Hub with Card Reader, Ports (...

Shop Now

Sandberg USB-C 13in1 DockingStation Pro

Shop Now

i-tec Universal Dual 4K Display Docking Station + ...

Shop Now

i-tec Metal SB-C Ergonomic 4K 3x Display Docking S...

Shop Now

HP Universal USB-C Multiport Hub

Shop Now

eSTUFF GLB232006 laptop dock/port replicator Wired...

Shop Now

i-tec USB-C Metal Nano Docking Station 4K HDMI LAN...

Shop Now

Kensington UH1500P EQ USB-C 5Gbps Triple Video Dri...

Shop Now

i-tec Metal USB-C Nano 3x Display Dock, 2x HDMI 1x...

Shop Now

Digitus USB-C 8K docking station, 12-port

Shop Now

Lenovo 01HY744 laptop dock/port replicator Docking...

Shop Now

i-tec USB-C Dual HDMI Docking Station with Power D...

Shop Now

i-tec USB-C DP Dual HDMI Docking Station with Powe...

Shop Now

i-tec USB-C Dual HDMI Docking Station with Power D...

Shop Now

2-Power USB 3.0 Dual Display Docking Station

Shop Now

StarTech.com USB C Multiport Adapter, Portable USB...

Shop Now

i-tec USB 3.0 / USB-C / Thunderbolt 3 Dual Display...

Shop Now

Lenovo 40AJ0135EU laptop dock/port replicator Dock...

Shop Now

StarTech.com USB-C Dock - Dual Monitor 1080p HDMI ...

Shop Now

Targus DOCK310EUZ laptop dock/port replicator Wire...

Shop Now

Anker A8380 USB 3.2 Gen 1 (3.1 Gen 1) Type-C Black

Shop Now

StarTech.com USB-C USB-A Dock - Hybrid Universal U...

Shop Now

StarTech.com USB C Dock - Triple 4K Monitor USB Ty...

Shop Now

DELL DA300 Wired USB 3.2 Gen 2 (3.1 Gen 2) Type-C ...

Shop Now

StarTech.com USB 3.0 Docking Station Dual Monitor ...

Shop Now

StarTech.com Triple-Monitor USB 3.0 Docking Statio...

Shop Now

StarTech.com USB-C & USB-A Dock - Dual Monitor 4K ...

Shop Now

HP Universal USB-C Multiport Hub

Shop Now

HP USB-C G5 Essential Dock

Shop Now

HP USB-C Dock G5

Shop Now

HP USB-C/A Universal Dock G2

Shop Now

HP USB-C Dock G5

Shop Now

HP USB-C Dock G5

Shop Now

Lenovo 40AY0090UK laptop dock/port replicator Wire...

Shop Now

HP Thunderbolt Dock 120W G4

Shop Now

HP USB-C/A Universal Dock G2

Shop Now

DELL WD25 Wired USB 3.2 Gen 2 (3.1 Gen 2) Type-C B...

Shop Now

HP USB-C Dock G5

Shop Now

Kensington UH1400P USB-C 8-in-1 Driverless Mobile ...

Shop Now

HP USB-C Dock G5

Shop Now

You may also be interested in

Compare Products
Product StarTech.com Universal Laptop Docking Station, Hybrid USB-C & USB-A Dock, Dual 4K DP & HDMI, 60W PD, Mac / Windows / Chrome OS, 4x USB 5Gbps Hub, GbE StarTech.com Universal Laptop Docking...
£96.85 £80.71
StarTech.com USB 3.0 Docking Station Dual Monitor with HDMI & 4K DisplayPort - USB 3.0 to 4x USB-A, Ethernet, HDMI and DP - USB Type A Universal Laptop Docking Station for Mac & Windows
Hot Product
StarTech.com USB 3.0 Docking Station D...
£93.56 £77.97
StarTech.com Triple-Monitor USB 3.0 Docking Station - 1x HDMI - 2x DisplayPort
Bestseller
StarTech.com Triple-Monitor USB 3.0 Do...
£101.80 £84.83
2-Power USB 3.0 Dual Display Docking Station 2-Power USB 3.0 Dual Display Docking S...
£107.12 £89.27
StarTech.com USB C Multiport Adapter, Portable USB-C Dock to 4K HDMI, 2-pt USB 3.0 Hub, SD/SDHC, GbE, 60W PD Pass-Through - USB Type-C/Thunderbolt 3 - REPLACED BY DKT30CHSDPD1 StarTech.com USB C Multiport Adapter,...
£78.19 £65.16
StarTech.com 4K USB-C Dock , Triple UHD 4K Monitor Docking Station, Mac & Windows, USB C to HDMI & DisplayPort, 60W Power Delivery, 5x USB 5Gbps Hub - TAA StarTech.com 4K USB-C Dock , Triple UH...
£111.64 £93.03
SKU
DK30C2DPPDUE
USB3DOCKHDPC
USB3DOCKH2DP
DOC0101A
DKT30CSDHPD
DK30CH2DPPDU
Manufacturer
StarTech.com
StarTech.com
StarTech.com
2-Power
StarTech.com
StarTech.com
Product colour
N/A
N/A
N/A
Black
N/A
N/A