With DC isolation power supply: suitable for refitting speakers, power amplifiers, and vehicles to add Bluetooth-Compatible function to solve common ground current sound and noise;With call, Qualcomm Bluetooth V5.0, APTX, APTXLL, power on, the default volume is the largest.Using TI amp TPA6132, the sound quality is better.L, G, R are single-ended output, which can be connected to input devices such as earphones, power amplifiers, audio, etc.M+ and M- are the positive and negative poles of the microphone.COM is the common end of the button, the other end of the button is connected to VOL+, VOL-, PREV, NEXT, PLY, and the button line is within 5cm.Key "VOL+": Short press to increase the volume, long press to increase the volume"VOL-": Short press to decrease the volume, long press to decrease the volume continuously"NEXT": Short press a song"PREV": Short press the previous song"PLY": Short press to play/pause/answer/hang up, long press for 1 second to reject the callSpecial function "PLY": Long press for 3 seconds to force enter pairing mode, long press for 6 seconds to clear the pairing listStyle:B DC isolated 5V power supplyColour:GreenMaterial:PCB+Plastic+MetalSize:3.6 x 3.3CMPackage Contents:1 * QCC3005 Bluetooth Audio ModuleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store