Description: Add up to 4 peripherals quickly and easily with the Sabrent HB-MCRM USB 2.0 Hub. Especially great for notebooks which come with only a few ports in an era when you need to attach many USB devices at once, such as a printer, card reader, cell phone, iPod, thumb drive, mouse, keyboard, or an external hard drive. Achieve full 480 Mbps on each port, or daisy chain multiple hubs to a maximum of 127 devices. Fully backwards compatible with the USB 1.1 products Please Note: For a stable connection, the devices connected to the 4 Port Hub must not exceed a combined current of 5 volts 500mAh. External hard-drives should be connected to an external power source. This 4 Port hub will not charge an iPad (it will only sync). Features: * Data transfer speeds up to 480 Mbps * Four downstream ports support high-speed (480Mbps), full-speed (12Mbps), and low-speed (1.5Mbps) * Supports up to 127 devices by daisy-chaining multiple hubs * Some power-intense USB devices may require a AC-Powered USB hub System requirements: * Mac OS 9.1 & higher * Windows 98SE /ME /2000 /XP /Vista /7/8 * Linux 2.4 or above Package contents * USB 2.0 4-port hub Warranty: This product comes with a one year warranty. In order for us to properly assist you, please follow these simple instructions: Go to sabrent.com/support and click "Submit a ticket". Submit your ticket. You must include your Amazon Order ID# number in the subject line.