Features: Bus Servo Driver Board Designed for bus servos.Integrated ESP32 and control circuitry can control up to 253 servos via ESP32 serial or USB interface can be used as mainboard for robotics projects Simultaneous control of up to 253 and RSBL series bus servos. Voltage input 9~25V (input voltage matching servo voltage) Based on ESP32-WROOM-32 module, supports various corded and wireless communication methods, provides various control routines, and facilitates various hardware control. Integrated 5V regulator circuit Communication via GPIO serial port reduces wiring complexity Specifications: Size:about 6.5x5.7cm/2.56x2.24in Integrated ESP32 Suitable for RSBL Series Bus Servos Package Includes: 1Set ESP32 Bus Servo Driver Board note: Due to the different monitors and light effect, the actual color the item might be slightly different from the color showed on the pictures. Please allow 1-2cm measuring difference due to manual measurement.