It adopts a mini motor, it is a compact size gearbox that can be mounted on 1/35 scale tanks as well as 1/48 scale heavy tanks and medium tanks. Since power consumption is small and noise is unlikely to occur, it can be widely used for RC conversion, sensor-based work, robot work and so on. The multistage gearboxes are 4.6: 1, 5.1: 1, 9.7: 1, 10.8: 1, 20.4: 1, 22.6: 1, 42.8: 1, 47.5: 1, 89.9: 1, 99.8: 1, 188.7: 1, 209.7: 1 12 gear ratios can be selected. Two mounting positions can be chosen, spreading widens. Case and gear are made of high precision plastic, 3 mm hexagonal output shaft is made of strong metal. There is also a crank plate that changes the movement. The gear case adopted a mechanical clear color. The size of the gearbox is about 30 mm in width, 17 mm in height and 30 mm in length. ? The basic voltage of this motor is 3V. (From Amazon.co.jp)