VIPstore&reg; New Bicycle Cycling Laser Tail Light Waterproof 2 Laser Beam 5 LEDs 7 Modes Mountain Bike Safety warning Back Rear Led Red Light (battery not included) 5 super bright LED.7 mode flash method( Alaways bright,burst flash,slow flash,flash left to right,right to left flash,flash left to right,back and forth about flash,turn off) 2 super bright laser line super thick satety warning,two modes(Always bright,stroboscopic,closed) Waterproof, safer in water fog when riding in the rain Use for jogging, walking, bicycles, car emergency, horse-riding, road emergency & camping, etc. Working: 9-36 hours depends on the batteries