SallyBest&reg; Digital Car Motorcycle Power Audio Amplifier FM Radio AUX Input MMC SD USB MP3 Player Reader 4-Electronic Keypad with Remote Control Compatible with format MP3 in memory type USB or SD. Support USB / SD / MMC memory card input. 4-Electronic keypad control. Power on/off and remote control. 100% Brand new, high quality, easy and convenient to use. Revolutionary amplifier technology, ultra compact design, light weight.