These are small motors but much more powerful than one expects. Having a couple of these in the toolbox will always come in handy. 

The perfect toy accessory, after strict testing, it is able to keep running for more than 3 hours with new 2 x 1.5V AA batteries(WithNoload). Great fun motor, and will work with many power sources batteries, and solar cells.

• Weight: 16g
• Voltage: DC 3V
• Current: 0.1A
• No-load Speed: 15000r/min
• Shaft Type: Round
• Shaft Diameters: 2mm/0.08 inch; 2mm/0.08 inch
• Shaft Lengths: 8mm/0.315 inch; 8mm/0.315 inch
• Motor Body Diameter: 19.7mm/0.78inch
• Motor Body Length: 25mm/0.98 inch
• Total Length: 45 mm/1.77 inch
• Commutation: Brush
• Winding Type: Permanent Magnet
• Enclosure Type: TEAAC (Totally Enclosed Air to Air Cooled)
• Operational Temperature: -25 to +65 degrees Centigrade