Does this hub provide power to any devices while the computer is turned off, or are the ports only activated while the computer is powered up?

if yo have it hooked up just with the normal USB, depends on the computer. If you have a micro-USB charger connected to the side port , it charges , as the ports are powered , does not matter is the USB port is even connected to the computer.

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TrippLite;U222-004-R;U222-004-R pdf - Tripp Lite

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Tripp Lite U222-004-R 4-Port USB2.0 Certified Ultra-Mini Hub

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4 x USB 2.0
USB 2.0/1.1

Overview

Specs

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The ultra small 4-port USB 2.0 hub is the most versatile and powerful hub on the market. This USB 2.0 certified hub allows you to connect up to four USB devices to a single USB port on a PC/mac/laptop.

Model
Brand	Tripp Lite
Model	U222-004-R

Details
Color	Black
Type	USB
Standards	USB 2.0/1.1
Ports	4 x USB 2.0
Transfer Rate	1.5/12/480Mbps
Weight	0.7

Features
Features	USB2.0 Certified Hub Features 4-ports to increase the number of available USB ports on a computer Compact design is ideal for use with a laptop/notebook computer - 3.5"L x 1.5"W x .5"H Extension cable provided for use with desktop systems Does not require external power, software, or complicated set-up procedures Plug-and-play/hot-swappable allows you to add or remove a device at any time Per-port overcurrent protection Diagnostic LEDs indicate power and port status Bus-powered or self-powered Compact, multi-voltage power supply (110/220V) provided Compatible with Windows 98, Windows 98 SE, Windows 2000, Windows ME, Windows XP and Mac OS 8.6 or higher

Additional Information
First Listed on Newegg	February 04, 2019

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Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by BeachAudio Return Policy

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Item#: 9SIA0ZX2C35212

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Tripp Lite U222-004-R 4-Port USB2.0 Certified Ultra-Mini Hub

Learn more about the Tripp Lite U222-004-R

Customer Reviews of the Tripp Lite U222-004-R

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Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info