Description <br> 1. Multiple parameters for customers to choose from <br> 2. Products using high-quality materials, quality assurance <br> 3. AUX audio input, Qualcomm for /ATPXHD programming, power on, the default volume is maximum, the volume of the alert tone is moderate <br> 4. Support Android APP to modify the Bluetooth name (support Chinese), pairing password, custom EQ <br> 5. Product performance is stable, <br> <br> Product description: <br> B: DC isolated 5V power supply 4.5-5.5V <br> 1, no DC isolation power supply: suitable for lithium battery power supply, used to modify the Bluetooth headset <br> 2, with DC isolated power supply: suitable for modifying speakers, amplifiers, car to increase the Bluetooth function, to solve the common ground current sound, noise <br> KCOM for the common end of the keys, the other end of the keys are connected to VOL+, VOL-, PREV, NEXT, PLAY, key line length of 5cm or less <br> Key Description: <br> VOL+: short press volume plus, long press continuous volume plus <br> VOL-: short press volume down, long press continuous volume down <br> NEXT: short press song <br> PREV: short press the previous song <br> PLAY: short press to play/pause, long press for 3 seconds to force into pairing mode, long press for 6 seconds to clear the pairing list <br> Special function description: <br> PLAY: long press for 3 seconds to force into pairing mode, long press for 6 seconds to clear the pairing list <br> PLAY +VOL+: press and hold for 1 second to enter TWS search mode <br> PLAY +VOL-: press and hold for 1 second to enter the searched TWS mode <br> VOL++VOL-: press and hold for 1 second at the same time to disconnect TWS <br> Colour:Black <br> Material:Plastic <br> <br> Package Contents: <br> 1x Bluetooth Music Module <br> <br> Only the above package content, other products are not included. <br> Note: Light reflection 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>