T-OI PLUS is based on the ESP32-C3 main control chip, which is a safe, low-power, low-cost RISC-V MCU. Supports Wi-Fi and Bluetooth 5 (LE). It has rich memory resources and can meet the functional requirements of various common IoT products. It continues the appearance and structural design of the T-OI ESP8266 version. It is based on the pin interface compatible with the MINI D1 expansion shield, and is equipped with a 16340 lithium battery holder. It is also compatible with the Grove interface, which is convenient for direct expansion of existing mini D1 expansion shields and Grove interface modules. MCU:MCU32-C3 USB to serial port chip:T-OI Plus V1.0: CH340K T-OI Plus V1.3: CH9102 Grove connector:4 Pin, 2.0mm Main chip:RISC-V 32-bit Microprocessor,400 KB of SRAM, 384 KB of ROM and 8 KB SRAM in RTC clock frequency:160MHz Analog Interface Protocol:2 x 12-bit SAR ADCs, up to 6 channels data interface protocol:3 x SPI, 2 x UART, 1 x I2C, 1 x 125 LED PWM, TWAI, Timers, RMT, Full-speed USB Serial Wi-Fi:IEEE 802.11 b/g/n-compliant Supports Station, SoftAP, SoftAP + Station mode Bluetooth:Supports Bluetooth 5, Bluetooth mesh Colour: As Shown Material:PCB style:A With battery holder / B Without battery holder Package Contents: 1 * ESP32-C3 RISC-V MCU Module 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.