The NRF51822 IC from Nordic Semiconductor is a powerful, highly flexible multiprotocol SoC ideally suited for Bluetooth® Low Energy and 2.4GHz ultra low-power wireless applications. The nRF51822 is built around a 32-bit ARM® Cortex™ M0 CPU with 256kB/128kB flash + 32kB/16kB RAM for improved application performance. The embedded 2.4GHz transceiver supports both Bluetooth LE and the Nordic Gazell 2.4 GHz protocol stack which is on air compatible with the nRF24L series products from Nordic Semiconductor.
 
Specifications of NRF51822 Bluetooth BLE4 2.4GHz Wireless Communication Module:-
Onboard chip: nRF51822
Communication distance (open outdoor@1M data rate): 30 m
Frequency range: 2.4GHz
Operating voltage: 2.0 Volts to 3.6 volts
Operating temperature: -40° ~ 85°
Expansion pin header: all the I/Os except P0.26 and P0.27
Pinheader pitch: 2.00 mm
Spacing between pin headers on the left side and the right side: 18.00mm
Antenna: onboard antenna 
 
Features of NRF51822 Bluetooth BLE4 2.4GHz Wireless Communication Module:- 
2.4 GHz multiprotocol RF transceiver
128 bit AES HW encryption
256kB 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 of NRF51822 Bluetooth BLE4 2.4GHz Wireless Communication Module:- 
Wearable devices
Bluetooth intelligent application
Mobile phone accessories
RFID labels
Smart home appliances
Industry control
Data acquisition system