Question 1

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

Accepted Answer

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))

Question 2

Can this drive three monitors?

Accepted Answer

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.

Question 3

Does it work with the p72s?

Accepted Answer

Yes I do believe it will work with a P72s

Question 4

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

Accepted Answer

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

ASIN	B019K6ET24
Best Sellers Rank	#67,089 in Computers ( See Top 100 in Computers ) #391 in Laptop Docking Stations
Brand	Lenovo
Color	Black
Compatible Devices	Lenovo Thinkpad P50, P51, P70, P71
Customer Reviews	4.6 4.6 out of 5 stars (345)
Global Trade Identification Number	00779184154433, 00889233920398
Hardware Interface	USB 2.0, VGA
Item Weight	2.16 Pounds
Manufacturer	Lenovo USA
Mfr Part Number	40A50230US
Model Number	40A50230US
Number of Ports	12
Smart Home Compatibility	Not Smart Home Compatible
Total Number of HDMI Ports	1
Total Usb Ports	6
UPC	779184154433 889233920398
Unit Count	1.0 Count
Wattage	230 watts

Lenovo Thinkpad Workstation Dock 230W US (40A50230US)

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