NA4  LOMEHO NA4 Sound Mixing 4 Channels Bluetooth Mobile USB Record Computer Playback 48V Phantom Power DJ Portable Mini Audio Mixer             A4 VS NA4                      NA4 Selling Point  1. 4 Channels ( 2 mono +1 stereo) 2. USB power supply: 5V DC 3. Bluetooth 4. Computer playback, soundcard function: Connect to Computer Via USB Cable 5. Mobile Broadcast podcast function 6. USB Play and Record 7. 24DSP Effects  1.Power Supply  1) Working Power: 5V DC A) Power adapter B) Computer supply power C) Power bank supply power               2) Power Supply Interfaces A) Micro B: Press down the button to choose Micro B interface. B) Type-B: Bounce up the button to choose Type-B interface Please Note:     Micro B Interface: Only for power supply Type-B Interface: Power supply + Data transmission              3)USB Cable:1 Meter (3.3 in)             2.Effect    Please Note:     The 24th effect is vocal. It is no orignal voice, there is no effect.        Choose the Effect  1) Press UP/DOWN button to choose the effect               Adjustment of Effect  1) Adjust the effect volume output to channel: Rotate the "FX/PC REC" knob to increase or reduce the effect volume 2) Press down the "FX/PC REC" button to allow the effect input to channel. Bounce up the "FX/PC REC" button to cancel the effect input to channel.       3.Bluetooth       1) Waiting for Pairing:  Press MODE to "BLUE", "BLUE" is flashing, and waiting for the pairing.             2) Bluetooth Connect:  A) Open your mobile bluetooth B) Choose "A6" C) Connected             3) Bluetooth Volume Control:  A) Rotate the PC/BT/MP3 knob to increase or reduce the bluetooth volume B) Rotate the MAIN knob to increase or reduce the main out volume         4.USB Play:    1) USB Play Format: MP3, WAV,WMA,FLAC 2) USB Play: A) Insert usb stick B) Press to choose "USB" C) Press MODE to choose "USB"          3) MP3 Volume Control: A) Rotate the PC/BT/MP3 knob to increase or reduce the USB volume B) Rotate the MAIN knob to increase or reduce the main out volume                5.USB Recording  1) Prepare for The Record:  A) Insert USB stick B) Press the button to USB status C) Press down channel "FX/PC REC" button D) Press MODE to choose "Blue" status       2) USB Record:  A) Long press "PLAY/PAUSE" to record, there will be a "REC" mark when you are recording. B) Long press "PLAY/PAUSE" to end the record.