YYGIFT Bicycle Cycling Laser LED Tail Light Mountain Bike Back Safety Warning Alarm Rear Light Laser Lane 5 LEDs 2 laser lights remind someone else of keeping distance, add safety.This little laser beam tail light will ensure your safety while riding in the darkness. Ordinary rainproof,safer in water fog when riding in the rain. Great for jogging,walking,bicycles,car emergency, horse-riding,road emergency & camping,etc. Working time:9-36 hours depends on the batteries . Batteries required:2 x AAA batteries (Not Included)