Fangrui Product Details 1. Waveshare Esp32 Servo Driver Expansion Board, Built-in Wifi And Bt 2. Features 3. Allows Controlling Up To 253 Sc, St Series Serial Bus Servos At The Same Time (adequate Power Supply Required) 4. Wide Range Voltage Input 6-12v (the Input Voltage And The Servo Voltage Must Be Matched) 5. Built-in Wifi And Bluetooth, As Well As Esp-now Support, For Remote Control And Servo Debugging 6. Automatic Download Circuit For Easy Uploading Programs 7. Open Source Web Application And Various Robot Structures 8. Compact Size And Space Saving, Suitable For Integration Into Sorts Of Space-limited Projects 9. Specifications 10. Power Supply Voltage: Dc 6-12v 11. Power Connector: 5.5 X 2.1mm Dc 12. Download Interface: Type-c 13. Controller: Esp32 14. Control Interface: Uart 15. Dimensions: 30 X 65mm 16. Mounting Hole Size: 2.75mm 17. Mounting Hole Spacing: 23 X 58mm 18. Package List 19. Servo Driver With Esp32 X 1 20. Screws Pack X 1