[My Applications] Portable device; Bluetooth Smart application; Mobile phone accessories; RF smart radio frequency tag; Smart; Industrial control; Data acquisition system. nRF51822 is a multiprotocol single-chip solution for ultra-low-power wireless applications (ULP wireless applications). It integrates Nordic's best-in-class wireless transmitter and supports Bluetooth(R) Low Energy and a dedicated 2.4 GHz protocol stack. Main Control Chip: nRF51822 Communication Distance: 30 m (condition: open area / 1 M speed) Working Frequency Band: 2.4 GHz Working Voltage: 2.0 V ~ 3.6 V Temperature Range: -40 ~ 85 Interface: All I/O interfaces except P0.26 and P0.27 Antenna: Built-in antenna 32-bit ARM M0 processor 128-bit hardware encryption processor 256 kB flash / 32 kB RAM Programmable peripheral interface Full digital interface: SPI / I2C / UART 10-bit ADC Programmable output power: +4 dBm to -20 dBm Application development and protocol stack are fully compatible with NRF24L series. Pin-compatible with NRF51xxx series. Global power management. Working voltage range (1.8 V ~ 3.6 V). Color: Blue Material: PCB Size: 20.8 x 17 mm Package Contents: 1 x Bluetooth Module Only the above package content is included; other products are not. Note: Light and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.