Fangrui Product Details Can Control Up To 253 Sc, St Series Bus Servos At The Same Time (provided That The Power Supply Is Sufficient) Wide Voltage Input 6-12v (input Voltage Must Match The Servo Voltage) Built-in Wifi And Bluetooth, Supports Esp-now, Can Remotely Control And Debug The Servo Automatic Download Circuit To Facilitate Program Upload Open Source Web Applications And Multiple Robot Structures Mini And Compact, Saves Space, Suitable For Embedding Into Various Projects With High Space Requirements Power Supply Voltage: Dc 6-12v Power Supply Interface: 5.5 X 2.1mm Dc Download Interface: Type-c Master Chip: Esp32 Control Method: Uart Through Hole Diameter: 2.75mm Positioning Hole Spacing: 23 X 58mm Main Use Diagram: The Servo Can Feedback A Variety Of Information: Position, Speed, Torque Lock, Operation Mode (servo Mode, Servo Motor Mode, Etc.) It Can Be Used For Advanced Projects That Require Closed-loop Automatic Control, And Can Be Used To Build Quadrupeds, Hexapods, Robotic Arms And Other Robot Projects That Requir