These are standard '130 size' DC hobby motors. They come with a wider operating range than most toy motors: from 1 to 6VDC instead of 1.5-4.5V. This range makes them perfect for controlling with an Motor Shield, or with an Arduino where you are more likely to have 5 or 6V available than a high current 3V setting. They'll fit in most electronics that already have 130-size motors installed and there's two breadboard-friendly wires soldered on already for fast prototyping
The motor is suitable for the connection of solar panels, can use as a normal motor, also can do a hand generator,Wind power generator,rotating the motor can drive the 3V led light, High power generation efficiency.The brush can work a long time,The carbon brush, can work for a long time.