4inch USB fan with I LED bulb light and 3 speeds switch: 1st step for slow wind, 2nd step for median wind, 3rd step for fast wind...over charge and over dischrge protection. Ideal for living,working and studying
3.7V 1200mAh, Li-ion battery, 500 recycle time.
luminous flux:50lm, life-span: 100000hrs
fan speed: 880-3400RPM
Recharging time: 4hrs
battery maintenance: charge it fully atleast once every month