Bluetooth+AUX audio input, 2.1 channel stereo output, just little sound distortion. Hifi sound quality for perfection, you will enjoy a more perfect sound quality experience. LCD display backlight and volume,treble and bass control knobs. U-disk and memory card reading, plug and play. With FM Faction. Widly compatible with mobile phones, computers, tablets, notebooks, MP3, MP4,TVs and projectors with AV audio etc AK-380 Bluetooth Connection Instructions 1. Press the function conversion key on the panel and switch to bluetooth playback mode. 2. Smart phone bluetooth play operation: turn on the function of bluetooth device. Then turn on the bluetooth function on the smartphone and tap the(search Settings) CHeHeme bf thelocal bluetooth wil be displayed on the available device. Click on the phone connect and wait for connection When you are on, the horn wllindicate (beep) that you are connected and then open your hand The music player on the phone Music, play/pause, volume level) with the button on the machine panel (last song, Next track, play/pause, volume level) two-way control. 3. When playing the bluetooth music of mobile phone, the device wll stop immediately if there is phone access Play music, turn to phone call mode or turn to the other voice for amplification, no When this device is needed for amplification, you can switch the bluetooth mode on the phone to the receiver Mode is ok.