Based ESP32-S2FN4R2 WIFI IC. Type-c USB 27 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported ADC, DAC, I2C, SPI, UART, USB OTG Compatible with shields Compatible with for MicroPython, for and for ESP-IDF Default firmware: for MicroPython Technical specs: Operating Voltage: 3.3V Digital I/O Pins: 27 Clock Speed: 240MHz Flash: 4M Bytes PSRAM: 2M Bytes Size:34.3 x 25.5mm color:Purple Material:PCB Package Contents: 4 x S2 Mini 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.