SMAKN&reg; MG946R Metal Gear MG946 13KG Torque Digital Servo For RC Car Boat Helicopter Temperature range: 0 to 55 Dead band width: 10us Operating voltage: 4.8-7.2V Stall torque:12kg/cm(6V) Operating speed: 0.20sec/60degree(4.8v); 0.17sec/60degree(6.0v)