SMAKN&Acirc; MG996R Metal Gears Digital RC Servo Motor High Torque Helicopter Car Boat Compatible with most standard receiver connector: Futaba, Hitec, Sanwa, GWS etc. Stall Torque: 13 kg / cm (4.8V), 15 kg / cm (6.0V). Operating Speed: 0.17 sec/60 (4.8V no load), 0.14 sec / 60 (6.0V no load) Operating voltage: 4.8 - 7.2V. Dimension: 40mm x 19mm x 43mm.