2010 Best sale dc cooler fanSpecifications1.Size:40*40*15 air cooler fan 2.Weight:20g2.Rated voltage:5v/12v3.Operating Temperature:Ball bearing:-40°C~+70°C Sleeve bearing:-20°C~+70°C4.Life Expectancy:Ball bearing:over 40000 hr.(At 40°C) Sleeve bearing:over 20000 hr. (At 40°C)