BW&reg; ES3154 Mini Metal Gear Digital Servo for RC Model Airplane Aircraft RC Accessories Operating voltage: 4.8V~6.0V Operating speed: 0.14sec/60 at 4.8V; 0.12sec/60 at 6.0V Stall torque: 2.5/3.0 kg.cm (4.8V/6v) Gear Material: Metal Connector type: Futaba/JR compatible