Water-resistant, super-slim, flexible silicon body, integrated lens, hold down button to "turn off" in any mode front & rear safety lights in a twin pack. The Boomer Front will fit handlebars from 22mm upto 32mm. The Boomer Rear easily wraps around your seat post or seat stay (25mm upwards). Front Light Burn Time: 4 hrs (constant) 36 hrs (strobe flashing) Dimensions: 68 x 50 x 34mm Weight: 53 grams (including batteries) Battery: 2 x AAA included LED Specs: Super-bright HIGH powered white LED Light Output: 50 lumens Modes: 1. Constant 2. Strobe Flash 3. Fast Flash 4. Random Strobe Rear Light Burn Time: 12hrs (constant) 72hrs (strobe flashing) Dimensions: 68 x 50 x 34mm Weight: 53 grams (including batteries) Battery: 2 x AAA included LED Specs: Super-bright HIGH powered red LED Light Output: 30 lumens Modes: 1. Constant 2. Strobe Flash 3. Fast Flash 4. Random Strobe