Be seen at night while on your bike. One of our many bicycle safety lights designed to keep you visible and safe on the road at night on your bicycle. Attach by taking wrapping and tightening the attached ring to the back of your bicycle. Four LED Functions: Flash, Still Light, Scrolling Flash, Random Flashing LEDs: 5 Red Dimensions: 4.5 in. wide Batteries: Includes 2 Replaceable AAA Batteries