1) Shaking it for 10 seconds, it keeps working for 15-20 minutes
2) No battery inside the flashlight
3) There is a big capacitor inside to keep power from
shaking and supply power
4) Waterproof
5) LxW:17x5.3cm

Packing:1pcs/color box
Carton Size:55x28x40.5cm
480pcs/ctn,g.w.13.5kgs,n.w.12.5kgs