DS3218MG Servo can be commonly used in robots, mechanical arms, climbing cars and remote control toys. The main features are fast heat dissipation, big torque high compatibility, sensitive and responsive ect. Good choice for university professors and students who are interested in developing software for robot parts. Specifications: Brand: DSSERVO Model: DS3218MG Item Name: DS3218MG Digital Servo Dead Band: 3μsec Operating Voltage: 6V~8.4Volts  Operating Speed (6V): 0.16sec / 60° at no load Operating Speed (8.4V): 0.14sec / 60° at no load Stall Torque (6V): 19 kg/cm (263.8oz/in) Stall Torque 8.4V): 21.5 kg/cm (298.5 oz/in) Motor Type: DC Motor Gear Type: Copper & Aluminum Working Frequency: 1520μs / 333hz CE Certification: Yes Weight: 60g Size: 40.5 * 40 * 20mm Note: The digital servo has a wide range of uses, pls according to your own requirements to choose battery. Recommended voltage: 6V-8.4V. There could be a few deviations due to manual measurement, thank you for your attention Package information: Package size: 6.8 * 6.8 * 4.3cm / 2.68 * 2.68 * 1.7in Package weight: 80g / 2.82oz General box package Package list: 1 * DS3218MG Digital Servo 1 * 25T Adjustable Metal Servo Arm