Powered by the powerful Nordic nRF52840 MCU and integrated Bluetooth 5.0 connectivity, this compact and elegant design is ideal for wearables and IoT projects. The single-sided SMD design and onboard Bluetooth antenna greatly facilitate rapid deployment of IoT projects. It includes a charging indicator and a tri-color LED. It has 11 digital I/O pins that can be used as PWM pins, 6 analog I/O pins that can be used as ADC pins, and supports three common serial interfaces: UART, I2C, and SPI. The board includes 2MB of onboard memory and can be programmed using for Arduino, for MicroPython, for CircuitPython, or other programming languages. Processor: Nordic nRF52840 32-bit processor, 64 MHz Wireless: Bluetooth 5.0/BLE/NFC Memory: 256KB RAM, 1MB RAM, 2MB onboard memory Interfaces: 1X12C, 1XUART, 1XSPI PWM/Analog Pins: 11/6 Onboard Button: Reset Onboard LED: Charging indicator, 3-in-1 tri-color LED Programming Language: for Arduino/MicroPython/CircuitPython Color: Black Material: PCB Package Contents: 2 x NRF52840 Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.