This part is a kind of semiconductor called NRF51822.

Function of this product has (NRF51 Series) Series Reference Manual.

Manufacturers : Nordic

Image and pinout :

Some of the text within the PDF file :

nRF51 Series Reference Manual Version 1.1 The nRF51 series offers a range of ultra-low power System on Chip solutions for your 2.4 GHz wireless products. With the nRF51 series you have a diverse selection of devices including those with embedded Bluetooth® low energy and/or ANT protocol stacks as well as open devices enabling you to develop your own proprietary wireless stack and ecosystem. TM The nRF51 series combines Nordic Semiconductor’s leading 2.4 GHz transceiver technology with a powerful but low power ARM® Cortex -M0 core, a range of peripherals and memory options. The pin and code compatible devices of the nRF51 series offer you the most flexible platform for all your 2.4 GHz wireless applications. TM All rights reserved. Reproduction in whole or in part is prohibited witho [ ... ]

NRF51822 PDF Datasheet Download