Factory-Outlet Ultra Bright 5 LED Bike Bicycle Rear Back Lamp tail light Safety Warning Flash with 6-Mode 7 function mode :Steady, 2 kinds of flashing and 4 kinds of running light Single button operation ,it controls multifunction blinking Quick release bracket, portable attach to your bicycle Convenient and easy to use, just only open the surface case and then install batteries, there is a on/off button behind of the light Long Battery Life: At least 200 hours, Battery: 2 x AAA batteries (not included)