DS3225MG RC Coreless Stainless Steel Gear Waterproof Digital Servo are ideal for cars, airplanes ,and robots. High-speed big torque digital servos. Fully Water-proof, Light Weight,Stable, fast heat dissipation, sensitive and Less Noise. Power cord is longer up to 11.6inches(29.5cm), and also send with two 25T adjustable metal servo arms. Electrical Specification: Operating voltage range: 4.8-6.8V. Operating speed ( 5.0V ): 0.15 sec/60 degree. Operating speed ( 6.8V ): 0.13 sec/60 degree. Stall torque ( 5.0V ): 21kg/cm. Stall torque ( 6.8V ): 25kg/cm. Control Specification: Control System: PWM (Pulse width modification). Pulse width range: 500-2500μsec. Neutral position: 1500μsec. Running degree: 180° (when 500-2500μsec). Dead band width: 3μsec. Operating frequency: 50-330Hz. Rotating direction: Counterclockwise (when 500~2500μsec). Gear ratio: 275. Bearing: Double bearing. Connector wire: 11.2inches(285mm). Motor: 3-pole(s). Waterproof performance: IP66. Product Specification: Standard Dimensions: 40 * 20 * 40.5mm. Weight: 67g. Package Including 2 x DS3225 25kg Digital Servo. 4 x 25T Adjustable metal servo arm. 2 x Accessories set as shown