Features: Good performance digitalservo, suitable for RC car, robots. Precision gears, more wear-resistant, not easy to collapse and sweep teeth, etc. Including servo,servo accessories package, 25t metal servo arm. A great choice for university professors and students who are interested in developing software for robot parts. Tailored for RC hobbyists to provide different experiences and delight. Warranty: If there are any problems, please contact our store in time. We will give you a satisfactory solution. Specifications: Item: Digital Servo Pulse Width: 500 s-2500 s =180 Operating Speed: (5V): 0.22sec60 Operating Speed: (6V) 0.21sec60 Operating Speed: (7.4V) 0.19sec60 Stall Torque (5V): 31kg.cm Stall Torque (6V): 35kg.cm Stall Torque (7.4V): 40kg.cm Dead Band: 3 s Ball Bearing: 2BB Working Frequence: 1520 s/330hz Size: 41*20*40.5mm Package information: Package Size: 6*5*3.8cm Package Weight: 88g Gift Box Package Packing List: 1 *40kg Digital Servo 1* 25T Servo Arm 1* Some Fittings