Featuring a hi-tech and innovative design, the Eyeboot 2-port hub enables two devices to share a single available USB port. The design has a Female DC 2.1mm*5.5mm adapter barrel for power input (5V 3A adapter is included). Eyeboot 2-port hub is recommended for high powered USB devices including smart phones, bitcoin miners, card readers, external CD/DVD players, or self-powered devices such as printers, storage drives, etc. Plug-and-play functionality allows quick and easy installation on your system. System Requirements - Eyeboot works across a large range of systems including: Windows XP/Vista/7/8, Mac OS 9/OS 10, Linux, and Android