Nordic nrf51822 Bluetooth low energy module

Features:
2.4 GHz multiprotocol RF transceiver
ARM® Cortex™-M0 32 bit processor
128 bit AES HW encryption
128kB flash & 16kB RAM
Programmable Peripheral Interconnect (PPI)
Digital interfaces: SPI, I2C, UART
10 bit ADC
Programmable output power: -20 to +4 dBm
Independent application development and protocol stack
Fully compatible with NRF24L series
Pinout compatible with NRF51xxx series
Global separate power management
Operating voltage: 1.8 V ~ 3.6 V

Applications:
Wearable devices
BT intelligent application
Mobile phone accessories
Smart home appliances
Industry control
Data acquisition system

Specification