Durability: N20 gear motors utilize miniature metal gears with excellent stall characteristics, heat and vibration resistance, making them ideal for challenging applications. WIDE APPLICATIONS: These DC motors are and small in size, making them ideal for DIY remote control toys, vehicles, drones and airplanes. They are great replacements for damaged or rusty gear motors in a variety of machines. Motor applicable voltage: DC3V-6V When unloaded, it can be started by 1 x 1.5V AAA battery.(Not included batteries) Motor size:10x12x15 mm size:10x12MM Output shaft diameter:3MM(with flat position, D-type shaft) Output shaft length:10MM Weight:9.5g Voltage: 2.5V, RPM: 20 rpm Voltage: 3.6V, RPM: . 40 rpm Voltage 5V, speed: 60rpm Colour:As Shown Material:Metal Package Contents: 8 * Geared motors Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.