Product Details： Introduction: Nrf52840 Is A Promicro Alternative Development Board That Is Compatible With For Nice! Nano. Its Pins Are The Same As Promicro, Which Means It Can Be Used With For Almost Any Promicro Keyboard. The Nrf5280 Development Board Has A 3.7v Lithium Battery Interface And A Software Switch That Can Cut Off The Power Of The Led. When Turned Off, The Standby Power Consumption Can Reach 1ma. Nrf52840 Is A High-performance, Low-power Wireless Soc Chip Launched. It Supports Multiple Wireless Protocols, Including Bluetooth 5, Thread, Zigbee, Ant, And 2.4ghz. The Nrf52840 Chip Uses An Arm Cortex-m4f Processor, Clocked At 64mhz, With Built-in 1mb Of Flash Memory And 256kb Of Ram. It Also Has A Variety Of Peripherals, Including Adc, Pwm, Spi, I2c, Uart, Usb And Gpio, Etc. In Addition, Nrf52840 Also Supports A Variety Of Security Functions, Such As Aes Encryption, Sha-256 Hashing And True Random Number Generator (trng). Product Parameters: Powerful Wireless Capabilities: Bluetooth 5.0 Onboard Antennapowerf