Features: - aluminum hair line front panel and knobs - toroidal big power transformer, original imported amplifier tube - usb/sd slot support mp3, wma, hifi ape, flac format audio files - with lcd display - bluetooth receiver, compatible with ios and android system - fm tuner, automatic search and save channels, can preset 50 channels - high level digital karaoke, can match with wireless microphone Technical specification - input impedance: 200mv/47ko - signal-to-noise:>78db - load impedance: 4~16o - frequency response: 20hz-20khz - output power: 100w+100w - machine size: 430x340x125mm