Specifications:

Simplecom CH241 Hi-Speed 4 Port Ultra Compact USB 2.0 Hub
CH241 4-Port USB 2.0 Hub is a simple and fast way to add four USB-A ports to any desktop or laptop computer, expanding connectivity for keyboards, mice, printer and other peripherals. Hi-speed USB 2.0 ports provide data transfer rate up to 480Mbps for external storage.
Designed with mini size, ultra slim and compact, easily slips into your pocket or computer bag, for anywhere you need easy, handy access to your USB devices.

Features
Four Hi-Speed USB 2.0 Type-A ports for additional peripherals
Supports up to 480Mbps data transfer rate
Compact size ideal for both desktop and notebook computers
USB Bus powered, hot-swappable
Cable reinforcement, sturdy exterior ensure durability
Plug and play, no driver software required
Windows, Mac and Linux compatible

Specifications
USB Revision: USB 2.0 (Backwards Compatible With USB 1.1)
Data Transfer Rate: up to 480 Mbps
Max Output: 2.5W (5V/0.5A) across all 4 ports
Cable Length: 25cm
Dimension: 9.5 x 3.0 x 1.0 (cm)
Operation Temperature: 0 - 40C
System Requirements: Windows XP and above, MacOS 9.1 and above, Linux

Important Note
This item is designed for data transfer, not for charging. Don't plug this Hub to any USB charger
For stable connection, the devices connected to the 4 Port Hub must not exceed a combined current of 5V 0.5A, external USB hard drive may need external power source.