The small motor is shaped like a cube. Because there is no outer casing, the internal structure is clearly visible. After power-on, the rotation of the rotor of the motor can be clearly observed. Voltage: 3V Shaft diameter: 1.5mm Dimensions: 18*19*9.7mm 3V voltage test: no-load current is about 140MA, blocking current is about 380MA, and no-load speed is about 7200 rpm