The Hexfly Torque Spec Waterproof Servo is perfect for your RC Truck, Boat, Plane or Robot. With all metal gears the Hexfly HX-TS is perfect for many RC enthusiasts. The Hexfly HX-TS Torque Spec digital servo features metal gears, aluminum center case for fast heat dissipation & is fully waterproof. With high quality and performance, it is tailored for RC hobbyist to provide an excellent experience at a great price. High torque - maximum torque up to 42kg.cm (8.4V) High-precision metal gear with hard anodizing for better accuracy and longer life CNC aluminum middle shell enhances heat dissipation Water proof, made of high-grade material to ensure longevity Operating voltage: 5.0 - 8.4V Operating speed ( 5.0V ): 0.16 sec/60 degree Operating speed ( 7.4V): 0.14 sec/60 degree Operating speed ( 8.4V ): 0.12 sec/60 degree Stall torque ( 5.0V ): 25kg/cm Stall torque ( 7.4V ): 35kg/cm Stall torque ( 8.4V ): 42kg/cm Working frequency: 50-333Hz Connector wire: 300mm (11.8") Gear type: Metal Motor Type: DC motor Servo Size: 40 x 20 x 40.5mm Weight: 67g 270° Rotation