Fangrui Product Details Esp32-c3 Supermini V2 Is An Iot Mini Development Board Based On Esp32-c3 Wifi/bluetooth Dual-mode Chip.it Has Excellent Rf Performance And Supports Ieee 802.11 B/g Wifi And Bluetooth 5 (le) Protocols. Onboard Antenna Interface And Rgb Module. It Also Has A Small And Exquisite Appearance Combined With A Single-sided Mount Design.it Supports Uart, I2c And Spi And Other Four Serial Interfaces. There Is Also A Small Reset Button And A Bootloader Mode Button On The Board. Esp32c3supermini Is A High-performance, Low-power, Cost-effective Iot Mini Development Board Suitable For Low-power Iot Applications And Wireless Wearable Applications. If External Power Supply Is Required, Just Connect The External Power Supply + Level To The 5v Position And Gnd To The Negative Pole. (support 3.3-6v Power Supply). Remember That When Connecting The External Power Supply, You Cannot Connect To The Usb. Only One Of Usb And External Power Supply Can Be . Note: Enter Download Mode: And Hold The Boot Button Of Esp32c3, Then The