What is the amp / wattage of the "always on" usb charge port on the back? is it 1 amp or 2 amp or more?

this is the info for the ac adapter : overview for ThinkPad 230W AC Adapter (slim tip) (4X20E751 11) Keep a spare ThinkPad 230W AC Adapter at hand to ensure your ThinkPad has a consistent flow of power. Keep one adapter in the office, one at home and another in your carrying case for immediat e, convenient access to power. This ThinkPad AC adapter is perfect for use as a spare or replacement adapter for compatible laptops. It is compatible with all Lenovo laptops with the rectangular “slim - tip” common power plug. It is not compatible with legac y notebook systems with the round, barrel - type power plug. ThinkPad AC adapters are compact so you can easily keep a spare tucked into your carry case at all times. This 230w adapter will perform to the exact same standard as the one which originally came with your laptop. It is highly energy efficient and is backed by an official Lenovo 1 - year warranty. PERFORMANCE SPECIFICATIONS  AC o AC type: Universal Input, Worldwide Agency Support o AC input voltage: 100 V to 240 V; 50/60 Hz o Input connection: Includes standard AC power cord PHYSICAL SPECIFICATIONS  Approximate height: 25 mm ( 0.98 in)  Approximate width: 98 mm ( 3.86 in)  Approximate length: 198 mm ( 7.8 in)  Weight: 775 g ( 1.71 lb) Package dimension: Approximate dimension: 380*150*54 mm (1 4. 96 x 5.91 x2. 13 in)  Weight: 1000 g OPERATING ENVIRONMENT  Temperature: 5 to 40 deg C (41 to 104 deg F)  Relative humidity: 8% to 80% non - condensing  Storage Temperature: - 31 to 60 deg (C) ( - 40 to 140 deg (F))

Can this drive three monitors?

See https://support.lenovo.com/us/en/documents/pd029622 for details on all possible monitor combinations supported by the Dock and a P50 or P70. Note that it is possible to have up to five displays supported using Thunderbolt.

Does it work with the p72s?

Yes I do believe it will work with a P72s

Description states a 90w power supply, why not a 230w?

I do not see 90 W. This is the description from Amazon Thinkpad AC Adapter (230W) Compatible with P50, P51, P70, P71 (not compatible with S-models) for this item Lenovo Thinkpad 230W Workstation Dock - 40A50230US (Compatible with P50, P51, P70, P71 Models

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Lenovo Thinkpad Workstation Dock 230W US (40A50230US)

Lenovo Thinkpad Workstation Dock 230W US (40A50230US)

Product ID: 24904682

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Details

Brand
Lenovo
Color
Black
Hardware Interface
USB 2.0 VGA
Compatible Devices
Lenovo P50 P51
Total USB Ports
6
Number of Ports
12

🌐Gigabit Ethernet with enterprise manageability

🔌6x USB 3.0 ports, one with always-on charging

🖥️Dual DisplayPort 1.2 + HDMI + DVI-D + VGA multi-display support

Description

⚡ Power Your Productivity, Dock Like a Pro!

POWERFUL USB HUB - Six USB 3.0 ports including one always-on charging port to keep your devices juiced and ready.
COMPACT YET ROBUST DESIGN - Sleek, space-saving form factor weighing just over 2 pounds, perfect for dynamic workspaces.
TAILORED FOR THINK PAD PROS - Optimized compatibility with Lenovo ThinkPad P50, P51, P70, and P71 models for flawless integration.
SEAMLESS MULTI DISPLAY SETUP - Connect up to four monitors simultaneously for ultimate productivity and immersive workflows.
ENTERPRISE GRADE CONNECTIVITY - Gigabit Ethernet ensures lightning-fast, reliable network access with advanced manageability.

The Lenovo ThinkPad Workstation Dock 230W (40A50230US) is a high-performance docking station designed exclusively for select ThinkPad P-series models. Featuring six USB 3.0 ports (one with always-on charging), multi-display support via DisplayPort, HDMI, DVI-D, and VGA, plus gigabit Ethernet with enterprise manageability, it transforms your laptop into a full-fledged desktop powerhouse. Its compact design and robust connectivity options make it an essential hub for professionals demanding seamless multitasking and reliable network performance.

Specifications

Standing screen display size	2 Inches
Screen Resolution	3840 x 2160
Max Screen Resolution	640 x 480
Number of USB 3.0 Ports	6
Brand	Lenovo
Series	40A50230US
Item model number	40A50230US
Item Weight	2.16 pounds
Product Dimensions	6.5 x 15.8 x 2.2 inches
Item Dimensions LxWxH	6.5 x 15.8 x 2.2 inches
Color	Black
Manufacturer	Lenovo
ASIN	B019K6ET24
Is Discontinued By Manufacturer	No
Date First Available	October 28, 2015

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