Powerhobby 400MG High Torque Speed Digital Servo Aluminum Servo Horn and other hardware is included. Perfect for scale crawlers, 1/8 1/10 monster truck, 1/8 1/10 2WD and 4WD buggies, as well as 1/8 scale buggies and trucks. In addition, this servo is great choice for boats and other application which require high power, high voltage and waterproof. Waterproof IP67 level up to 1 meter which allow driving in the rain, puddles, snow and mud. High reliable and durable patent gear design. Middle Aluminum case for fast heat disppation. High precision digital control circuitry. Features: High performance standard digital servo Built-in magnetic sensor Waterproof IP67 High precision steel gear High efficiency brushless motor High strength dual ball bearings Middle Alumiunm case Ideal for 1/10, 1/8 on road, off road, truck/cars Programmable ( required Powerhobby USB ) Specs: Operating Voltage: 4.8-8.4 V Operating speed: 0.16 sec/60° @ 6.0V Operating speed: 0.14 sec/60° @ 7.4V Operating speed: 0.13 sec/60° @ 8.4V Stall Torque: 26kg - 360 oz-in @ 6.0V Stall Torque: 29kg - 400 oz-in @ 7.4V Stall Torque: 32kg - 444 oz-in @ 8.4V Gear: Steel Motor: Coreless Size: 40*20*37.2mm (1.57 x 0.78 x 1.46 in) Weight: 53g Connector Wire: JR 300 mm Spline: 25T