This part is a kind of semiconductor called B426-AB1510.

Function of this product has Stereo Module.

Manufacturers : TGD

Image and pinout :

Some of the text within the PDF file :

Taiwan Goodark Technology Co.,Ltd B426-AB1510 Revision History Version 0.10 0.20 Change Summary Created Update Bluetooth Specification Version Date Dec, 25th, 13 Jun, 15th, 14 Author LY Kuo LY Kuo 1 System Overview 1.1 General Description B426-AB1510 is a stereo module, which are highly integrated, cost effective, low power consumptions with Airoha AB1510 chip for intensive audio applications. It complies with Bluetooth system version 4.1 with EDR function. The built-in noise reduction and echo cancellation functions enhance the voice quality. Advanced multipoint supports HFP connection to two handsets for voice, or two A2DP sources for music play back. The voice prompt function can be customized by customers for different voice commands. 1.2 Features ò Bluetooth 4.1+EDR compliant [ ... ]

B426-AB1510 PDF Datasheet Download