Perfect for educational use or as a DC source for low-power outdoor electronics.  I've used this in combination with my 1 Watt 6V solar panel  (CLICK HERE).  I had to water-proof it but with the addition of my 1000mAh li-ion cell, (CLICK HERE) it provides enough power to keep my ESP8266 + sensors running day and night.  

Or, you could just light the supplied LED.

Specifications:

Material: Plastic+Electrical components
Colour: Yellow
Output voltage : DC 0.01v - 5.5v
Output current : 0.01 - 100mA
Rated speed : 100 - 6000 rev/min
Motor diameter : 24.5mm/0.96"(appr.)
Motor height : 34.2mm/1.35"(appr.)
Motor shaft diameter : 2mm/0.079"(appr.)
Motor shaft length : 13.5mm/0.53"(appr.)
Blade Aperture : 1.95mm/0.077"(appr.)
Blade Size: (Dia.)X(H)10X6cm /3.94''X2.36''(appr.)(after assembling)

Misc:

Mini design, great demonstration effect, practical and durable.
It is a very good demonstration of wind power teaching tools.
Can also be used for making a variety of small electronics installations as well as model making.

Kit includes:

1 X Motor
1 X LED
1 X Axle
4 X Turbine Blades