Waveshare ESP32 Servo Driver Expansion Board, Built-In WiFi and BT Features 1. Allows controlling up to 253 SC, ST series serial bus servos at the same time (adequate power supply required) 2. Wide range voltage input 6-12V (the input voltage and the servo voltage must be matched) 3. Built-in WiFi and Bluetooth, as well as ESP-NOW support, for remote control and servo debugging 4. Automatic download circuit for easy uploading programs 5. Open source web application and various robot structures 6. Compact size and space saving, suitable for integration into sorts of space-limited projects Specifications 1. Power supply voltage: DC 6-12V 2. Power Connector: 5.5 x 2.1mm DC 3. Download interface: Type-C 4. Controller: ESP32 5. Control interface: UART 6. Dimensions: 30 x 65mm 7. Mounting hole size: 2.75mm 8. Mounting hole spacing: 23 x 58mm Package List 1. Servo Driver with ESP32 x 1 2. Screws pack x 1