does the plug come with this?

It comes both with the power adapter (plugging into the wall outlet) and a short thunderbolt cord (male to male) connecting to your laptop.

is this 45 watts or 65 watts?

Neither. It's 135 Watt. The power brick comes with it. It can pass through a charge to a laptop so it needs more power to it. The pass through to the laptop I believe is 65 Watts at least because it supports ThinkPad X1 rapid charging and I believe that rapid charging requires 65 watts.

how many monitors total can I hook up to this? I need 4

See https://support.lenovo.com/us/en/solutions/pd029622 . It is unlikely that you can get more than 3 monitors working well on this dock. You might get 3 on the dock and 1 from the laptop's built-in HDMI or DP port, but most laptops don't have the GPU to run 4 monitors very well.

Will this allow for the use of 3 monitors?

You can do 3 monitors with it, but limited to 1080p. You can do 2 monitors + laptop screen or do 3 monitors if you connect one to the vga port. This also is depending on your GPU in your device, but most if not all devices that have thunderbolt 3 can handle 3 screens at 1080p.

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Lenovo Thinkpad Thunderbolt 3 Docking Station (40AC0135US)

Product ID: 43508943

Details

Brand
Lenovo
Color
Black
Compatible Devices
Thunderbolt C
Hardware Interface
USB 3.0
Item Weight
8.8 ounces
Number of Items
1

⚡40Gbps ultra-fast data transfer

🔌135W power delivery with rapid charging

🖥️Supports up to 3 FHD or 2 UHD displays

COP 754953

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your productivity with the dock that keeps up with your hustle!

ALWAYS ON USB POWER - Keep your mobile devices charged anytime via the dedicated always-on USB 3.0 port.
MULTI DISPLAY MASTERY - Expand your workspace with up to three Full HD or dual UHD monitors for ultimate productivity.
ONE CABLE CONVENIENCE - Simplify your setup with a single Thunderbolt 3 cable connecting all peripherals instantly.
OPTIMIZED FOR THINK PAD X 1 - Perfectly paired for rapid charging and compatibility with your ThinkPad X1 series.
LIGHTNING FAST DATA TRANSFER - Experience blazing 40Gbps speeds—4x faster than typical docks for seamless multitasking.

The Lenovo ThinkPad Thunderbolt 3 Docking Station (40AC0135US) delivers ultra-fast 40Gbps data transfer, supports up to three Full HD or dual UHD displays, and provides 135W power delivery for rapid charging. Designed for seamless single-cable connectivity, it features an always-on USB 3.0 port to keep your devices charged and is optimized for ThinkPad X1 laptops, making it an essential hub for professional multitasking and workspace expansion.

Specifications

ASIN	B071NWZDJB
Best Sellers Rank	#25,381 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #1,091 in Laptop Docking Stations
Brand	Lenovo
Built-In Media	ThinkPad Thunderbolt Dock
Color	Black
Compatible Devices	Thunderbolt, USB C
Customer Reviews	3.5 out of 5 stars 411 Reviews
Global Trade Identification Number	00190940147085
Hardware Interface	USB 3.0
Input Voltage	135 volts_of_alternating_current
Item Dimensions L x W x H	8.66"L x 3.15"W x 1.18"H
Item Type Name	Lenovo ThinkPad Thunderbolt Dock (40AC0135US)
Item Weight	8.8 ounces
Manufacturer	Lenovo
Mfr Part Number	40AC0135US
Model Number	40AC0135US
Number of Items	1
Number of Packs	1
Number of Ports	5
Product Dimensions	8.66"L x 3.15"W x 1.18"H
Total USB Ports	3
Total Usb Ports	3
UPC	689227626790 190940147085
Unit Count	1 Count
Wattage	135 watts

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