Sportsun Safety Zone Tail Light, Rear Tail Bike Light with 2 LED and 3 Light Mode Made of lightweight material with a steady structure 3 flashing modes to attract attention and maintain constant security Weather proof casing and a touch sensitive switch to activate flashing modes Powered by 2 AAA batteries which give more than 100 hours of safety and illumination Comes with seat mount that fits on any standard bicycle and can be attached to the rear as well.