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 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.