PGMTDEFXJOelectronic starter size: 15.2*18.5mmGearbox diameter: 15.8mmGearbox length: 16.7mmOutput Shaft diameter: 4mm Rated voltage: 6V Voltage range: DC 5-7.2VReduction ratio: 1:100Weight: 14g No-load speed: 72RPM@5V, 88RPM@6V, [email protected]: 59mA@5V, 65mA@6V, 83mA @7.2VThe test is powered on, the sound is very soft, the gearbox accuracy is very good. The torque is quite good, suitable for DIY micro-robot power, or climbing car and other car model power motors.Package included:electronic starter x1