What is the future and benefit of usb  rechargeable flashlight   ?

 1. selection of international brand LED light source , energy-saving, longevity and maintenance-free; high brightness, glare irradiation distance up to 500 m ,effect distance up to 300 m; about 10 hours of continuous glare light illumination, about 20 hours of normal light, completely satisfied the demands ; the lamp equipped one a single charged can be provide about 50 hours of continuous working light and strobe function.

2. Special lithium batteries ,no memory, no pollution, big capacity, recycle, stable performance, low self dis-charge, and charge – discharge any time.
3. Lamp equipped charged by cell phone, satisfied to cell phone emergency charged , meantime the lamp mounting power indication can help to get remaining power and using time
4. Lightweight of the lamp, hand held or hang on shoulder, magnetically attached , easy to carry. Lamp head can adjustable range within 120°up and down, and also as mobile table lamp.
5. Optimized structure design and special anti-bullet glue material ,ensure that can afford strong impact, excellent sealing performance, can be work in rain and snow day
6. Equipped hand-charging emergency function, hand 100 rpm(revolutions per minute) can work about 30 minute ,To meet the temporary needs of artificial lighting fast charge, AC charger and vehicle charger can be choose

what is the detail of usb rechargeable flashlight   ?