EMB EBK17 500W Stereo Amplifier with Remote Built-in Bluetooth, Built-in HI-FI stereo player, Bulit-in FM with searching channel automatically. Radio /MP3 / USB / SD player with Memory Functions. Output power:500W, Output mode:4-16 70V 110V, Power source:100V/60Hz Frequency response60Hz-16KHz2dB, Input sensitivity-50dB/600Line-10dB/10K Function included: Bluetooth / USB / SD / FM Radio / MP3 / WMA Player