Micro-motor 1.5 v - 9 v 300 motor mute motor for solar panels-----Micro-motor motor solar panels special motor low starting voltage, high efficiency Also can be used in four-wheel drive motor. The diameter of 24.5 mm is 12.5 mm, shaft length: 6 mm, diameter of axle: 2 mm Voltage range: 1.5 v - 9 v