This part is a kind of semiconductor called CSR8811.

Function of this product has BlueCore A08 0.5mm WLCSP Bluetooth v4.0.

Manufacturers : CSR

Image and pinout :

Some of the text within the PDF file :

CSR8811 A08 0.5mm pitch WLCSP Data Sheet Features BlueCore® CSR8811™ A08 0.5mm WLCSP Prepared for eric zhang - excelpoint.com.cn - Wednesday, July 30, 2014 ■ Dual-mode Bluetooth®/Bluetooth low energy radio ■ Fully qualified Bluetooth v4.0 IC ■ Bluetooth Smart Ready ■ Can form part of Bluetooth v4.0 + HS system ■ Class 1 or Class 2 Bluetooth power levels ■ High-sensitivity Bluetooth and Bluetooth low energy receiver ■ Full-speed Bluetooth operation with full piconet and scatternet support ■ On-chip balun and minimal BOM ■ Low-power selectable 1.2 to 3.6V I/O ■ Integrated I/O and core regulators ■ High-speed UART port (up to 4Mbps) ■ HFP v1.6 wide-band speech supported on-chip ■ On-chip encoding of SBC and aptX® codecs for A2DP music streaming ■ PCM/I2S d [ ... ]

CSR8811 PDF Datasheet Download