Link Sprite Link Sprite Ble Gateway HAT for Raspberry Pi
This is a Bluetooth module for raspberry pi, which uses the chip nRF51422, the factory firmware is set to transmit transparently mode. The module comes up with the download port, and you can re-burn the firmware. NRF51422 is a single chip solution which support multi-protocol. It is widely used in PC peripherals, Internet TV remote control, sports / fitness / health sensors, toys and automation applications.