Quick Prototyping; Rich peripherals; No Soldering Needed; Circuit Python Supported; Mini Size Specification for Seeeduino XIAO CPU: ARM Cortex-M0+ CPU(SAMD21G18) running at up to 48MHz Storage: 256KB Flash,32KB SRAM I/O PINs: 14 GPIO PINs,11 analog PINs, 11 digital PINs, 1 DAC output Pin Interface: 1 I2C interface,1 UART interface, 1 SPI interface Power supply and downloading interface: USB Type-C interface LEDs: 1 user LED, 1 power LED, two LEDs for serial port downloading Reset button: two reset button short connect to reset Power Pads: For the battery power supply Software compatibility: Compatible with Arduino IDE Projection cover for protecting the circuit Dimensions: 20x17.5x6 mm Attention All the I/O pins are 3.3V, please do not input more than 3.3V, otherwise, the CPU may be damaged. battery is not included in this product Part list :Seeeduino XIAO expansion board* 1;Seeeduino XIAO (Pre-Soldered)*1