These are 2 types to choose :1) 160W DC 5V-25V :2*80W Amplifier , DC 5V-25V2) No Amp DC 12V :Without Amplifier , DC 12V 160W DC 5V-25V Description: 1 Bluetooth edition five 2 6 microphone functions three Support calling (long press the pause button to answer the decision when there is a call)4 Support recording Recording solely helps operation in TF mode or USB mode(Long press the MODE button to start recording, long press the MODE button back to cancel the recording and play the recorded file; go out the recording mode and lengthy press the pause button to exit When recording, you need to join a storage device, comparable to a U disk or TF card;)5 Support power-off memory6 The strength supply voltage supports between DC 5v-25v, and the present is above 2A7 Can be instantly connected to speakers8 Support music layout MP3/WMA/WAV/APE/FLAC9 Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/remote control/10 Power 160W, stereo 2*80W Support folder alternative to play When USB or TF is playing, there's a folder in the device and there are songs in the folder Press the previous button or the next button twice to choose the folder to play songs, and the screen will exhibit F001-F00? and so on, yes? A folder displays F00? MP3 Decoder Board connection diagram Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/remote management Bluetooth edition 5 Support 6 microphone with Volume Control 160W Amplifier Support 6 karaoke microphone Support multiple devices wi-fi Bluetooth 5 MP3 decoder board Support Handsfree call Big handheld remote control Small remote control Long Range wireless Bluetooth control Size: MP3 Decoder Board :130mm*57mm*50mm Big distant control:119mm*40mm Small remote control:85mm*39mm No Amp DC 12VDescription:1 Bluetooth version 5 6 microphone functions3 Support calling (long press the pause button to answer the decision when there is a call)4 Support recording Recording solely helps operation in TF mode or USB mode(Long press the MODE button to start recording, lengthy press the MODE button again to cancel the recording and play the recorded file; exit the recording mode and long press the pause button to exit When recording, you need to connect a garage device, comparable to a U disk or TF card;)5 Support power-off memory6 The energy supply voltage supports DC 12V