To activate your LED Bicycle Headlight, just press the button located on top for THREE functions: Scrolling Flash, Fast Flash, Steady Light. Then press the button a fourth time to shut it off. Just strap it to the front of your bicycle, no matter what kind (Red and White Beach Cruisers with Streamers and a Tiger Head on front preferred). LED Colors: White, Red Dimensions (L x W x H): 2.25" x 2.38" x 1.75" Comes ready to use with 3 replaceable AAA Batteries