Powerful CPU: ESP32-C3, 32-bit RISC-V single-core processor running up to 160 MHz WiFi: 802.11b/g protocol, 2.4GhHz, supports Station mode, SoftAP mode, SoftAP+Station mode, mixed mode Blue-tooth: Bluetooth5.0 Ultra-low power consumption: Deep sleep power consumption is about 43A Rich board resources: 400KB , 384KB ROM and built-in 4M flash Chip model: ESP32C3FN4 Ultra-small size: as small as thumb (22.52x18mm) Classic form factor for wearables and small projects Robust security features: Crypto hardware accelerator supporting -128/256, hashing, , HMAC, digital signatures and secure boot Rich interfaces: 1xI2C, 1xSPI, 2xUART, 11xGPIO(PWM), 4xADC Single-sided component, mount design Onboard LED blue light: GPIO 8 pins If external power supply is required, simply connect the external power supply+level to the 5V position and connect the GND to the negative pole. (Supports 3.3-6V power supply). (Due to different product batches, the appearance , which does not affect the use) Colour:Black Material:PC+Plastic Package Contents: 1x 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.