... 4.75V, Max 5.5V Portable Amplifier with USB SD Card Mp3 Mini Car Speaker F12 Specification: *100 ... which is disign exquisitely, convenient to carry - With LCD Screen, you see the operation of yours ... low power dissipation - Support by connecting with U disk and inserting Micro SD card, MP3 format music - PC, laptop ... /Silver/Blue/Red Picture: Portable Amplifier with USB SD Card Mp3 Mini Car Speaker F12