All in 1 card reader card reader, Usb card reader, Multi card reader SPECIFICATION No External Power Needed,Support Hot Plug DC 5V (USB port) Max Electric Current:500mA Version:USB 2.0 Size : 74 x 25 x 16 mm (L*W*H) Net Weight : 40 g Power Input : AC 110V 240V DC 5V 2A (Make sure 2A)