If you have any quality problems, please feel free to contact us and we will provide you with the most satisfactory answer.Specification:Name: CSR8645 bluetooth 4.0 Receiver ModuleSize: 2.9x2.9cm Features:DC isolated power supply: suitable for modified speakers, power amplifiers, car bluetooth, perfect solution to common ground current sound, noise.You can connect 2 mobile phones at the same time (the only way is to automatically back-chain the last paired mobile phone, and the second paired mobile phone needs to be manually connected).With call function, CSR8645 low power, power on, the default volume is maximum.Using TI amp TPA6132, better sound quality.GND and BAT power the 3.7V lithium battery.GND and VCC are 5V or 12 and are selected according to DC isolation.OUTL, AGND, and OUTR are balanced outputs and can be directly connected to input devices such as headphones, amplifiers, and stereos.COM is the public end of the button. Connect the other end of the button to VOL+, VOL-, PREV, NEXT, and PLY.M+ and M- are the positive and negative sides of the microphone.Package included:1 x CSR8645 bluetooth 4.0 Receiver Module
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