High-Performance MCU: Nordic Semiconductor's nRF52840 chip with FPU at 64 MHz, multiple development ports, compatible with for Arduino/CircuitPython/MicroPython. Advanced Wireless Connectivity: Bluetooth 5.0 with built-in antenna and NFC support. Efficient Power Management: 5 μA deep sleep consumption with integrated Li-ion battery charging. Expanded 20 GPIOs: 9 extra 1.27mm pitch SMD castellation pins beyond standard XIAO nRF52840. Universal Compatibility: Standard backside layout (with aligned battery pads, and debugger pads) for more to-be-released XIAO expansion boards. for XIAO Accessory Add-ons Compatibility: Natively compatible with all the XIAO accessory add-ons of expansion, connectivity modules (LoRa, CAN_Bus, RS-485), sensors (2-Mic Array, Vision AI, mmWave Motion, Environmental sensing), and actuators (ePaper display, LED Matrix, relay and more). Colour:black Material:PCB Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 2 x 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.