1、For Zhouyu servo extension board is a servo motor expansion peripheral control devices, designed to facilitate the for Zhouyu robot controller and for EV3 controller can control more servo motors (steering gear). 2、A servo extension board provides six additional servo motor output channels and two continuous rotation (CR) servo motor output channels. If you want to control more servo motors. 3、The servo extension boards can be connected in series. A maximum of four servo extension boards can be connected to the for Zhouyu Robot controller and for EV3 controller at one time. 4、It has expansion ports that connect to the for Zhouyu Robot controller and for EV3 controller, allowing users to add a servo extension board to control up to six servo motors and two continuous rotation (CR) servo motors. 5、Up to four servo extension boards can be connected to the for Zhouyu Robot controller expansion port and the for EV3 sensor port. 6、The servo extension board can be directly connected for EV3 sensor port. Using for EV3 programming system and programming language, for EV3 can directly program and control the for Zhouyu high‑power servo motor (steering gear). Provide for EV3 software plug‑in module)  1 x Host  1 x Motor Connection Line  1 x 6-Pin Right Button Single Crystal Head Sensor Cable  4 x Screw  4 x Nut  Item Type: Steering Gear Expansion BoardInput Voltage: DC12V