he Hexfly 25KG High Torque Waterproof Servo is perfect for your RC Truck, Boat, Plane or Robot. With all metal gears and the included aluminum 25t servo arm, the Hexfly HX-3225 is perfect for many RC enthusiasts. The Hexfly HX-3225 25KG 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 25kg. cm (6.8V) -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: 4.8 - 6.8V -Operating speed (5.0V) : 0.14 sec/60 degree -Operating speed (6.8V) : 0.13 sec/60 degree -Stall torque (5.0V) : 21kg/cm -Stall torque (6.8V) : 25kg/cm -Dead band: 3s -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