SallyBest&reg; USB SD DVD FM Audio Stereo Radio MP3 Speaker Car Bluetooth Amplifier HiFi Mini 2 Channel Digital Display Power Player for iPod / Car / Boat / Motorcycle With Bluetooth function, let you listen to music conveniently. Sound mode digital display. 4-Electronic keypad control helps you operate the amplifier easily. It can play U disk SD / MMC card for music and FM Car Motorcycle Stereo radio, support MP3 music format. Seleted high-power four-channel professional power amplifier integrated circuits, minimal distortion strong power. DSP sound field pattern of the four. Filtering and anti-large-capacity power circuit.