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 uploadOpen source web applications and multiple robot structuresMini and compact, saves space, suitable for embedding into various projects with high space requirements Power supply voltage: DC 6-12VPower supply interface: 5.5 x 2.1mm DCDownload interface: Type-CMaster chip: ESP32Control method: UARTThrough hole diameter: 2.75mmPositioning hole spacing: 23 x 58mmMain 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 require multiple servosColour:BlackMaterial:PCB Package Contents:1x Servo Driver with ESP321x Screw Pack 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.