Features: Brand new and high quality Allows controlling up to 253 SC, ST series serial bus servos at the same time (adequate power supply required). Wide range voltage input 6-12V (the input voltage and the servo voltage must be matched). Built-in WiFi and Bluetooth, as well as ESP-NOW support, for remote control and servo debugging. Automatic download circuit for easy uploading programs. Open source web application and various robot structures. Compact size and space saving, suitable for integration into sorts of space-limited projects. Specifications: Material: PCB Note: Please allow 1-2mm error due to manual measurement. Pls make sure you don'for t mind before you bid. The color may have different as the display difference, pls understand. Package includes: 1 x ESP32 Servo Driver Expansion Board