used as mouse pad, play music, 4 port usb 1.1 hub, 2 stereo speaker 1,USB1.1 compatible, support data tansfer ... rate of 1.5/12 Mbps2,4 usb port with ... when turn onproduct size:24.3*21*2.2cmpower: 5V USB line or DC 5V adapter(no included) USB1.1 music ...