Part Number: ST3215 Servo 30KG Serial Bus Servo, High precision and torque, with Programmable 360 Degrees Magnetic Encoder, Two-way Feedback, Servo/Motor Mode Switchable Allows controlling up to 253 serial bus servos at the same time Up To 30kg. Cm Torque On 12V Voltage, Suitable For Building Quadruped Robots, Hexapod Walkers, Robotic Arms And Other Robotic Projects Requiring Multiple Servos Adopts 12-bit high-precision magnetic encoding angle sensor. Compared with the potentiometer, the angle is enlarged to 360°, and the resolution is increased by 4 times. Since there is a gap and no friction between the magnetic encoder and the radial magnet, the lifetime of the servo is effectively extended.