This modular system combines aluminum or carbon fiber arm segments with Torxis servos. The base joint servo (i01856) is pre-programmed for 270 degree travel while the upper 3 joint servos (i01855) are programmed for 90 degree travel. Servo torque is 1600 oz*in nominal with 3200 oz*in peak torque. Servos are included. These arms lift 5 lb and move quickly. Reach radius is 27.6″ (70cm). 12 VDC power is required. Responds to popular “RC PWM” signals as generated by radio control units and micro-controllers like the Arduino. Refer to datasheet for signal pin-out and mechanical information.