This part is a kind of semiconductor called IS1685S.

Function of this product has Noise Reduction Mono Headset IC.

Manufacturers : ISSC

Image and pinout :

Some of the text within the PDF file :

Datasheet IS1685S Noise Reduction Mono Headset IC with A2DP streaming 1. General Description ISSC IS1685S is a compact, high integration, ultra-low cost, CMOS single-chip RF + baseband IC for Bluetooth v3.0(EDR) (Enhanced Data Rate) 2.4GHz applications. This chip is fully compliant with Bluetooth specification and completely backward-compatible with Bluetooth 1.1, 1.2, 2.0 or 2.1 systems. It incorporates Bluetooth 1M/2M/3Mbps RF, single-cycle 8051, TX/RX modem, memory controller, task/hopping controller, UART interface, and ISSC Bluetooth software stack to achieve the required Bluetooth v3.0(EDR) functions. The IS1685S is designed to support high quality voice application, an audio engine and a high performance mono CODEC are integrated for this purpose. The audio engine provides the A-law [ ... ]

IS1685S PDF Datasheet Download