FeaturesPowerful CPU:Nordic nRF52840, ARM - 32-bit processor with FPU operating at 64 MHzWireless capabilities: Bluetooth-compatible 5.0Ultra-small size: 21 x 18mm, series classic form-factor for wearable devicesUltra-low sleep power: 5 A, deep sleep modelBattery charging chip:BQ25101chip supported lithium battery charge management interface: 1x Reset button, Ix UART, 1x IIC, 1x SPI, 1x NFC, 1x SWD, 11x GPIO, 6x , 1x Three-in-one LED,1x LEDOnboard 2 MB flashOnboard PDM microphone and 6-axis IMU (only forXIAO nRF52840 Sense)Single-sided components, surface mounting designDescription:To better support IoT and TinyML AI projects, there is an advanced version " Sense" that carries both 6-axis IMU and PDM microphones.Compare to RP2040, has a richer interface. The first thing to note is that the Near Field Communication(NFC) is functional on the board. Secondly, there is a and elegant reset button on one side of the Type-C interface. On the other side, it is designed in a three-in-one LED along with a power LED. There are 11 digital i/o that can be used as PWM pins and 6 analog i/o that can be used as pins.It supports UART, IIC, and SPI all three common serial ports. Same as RP2040, it has an onboard 2 MB flash which means it can also be programmed by for , for MicroPython, for CircuitPython, or other languages.Color: white + blackMaterial: PCBPackage Contents:1 x Development BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.