Theft-proof lightweight aluminum bike headlight locks on to handle bars with custom security screw * Weather-proof bike light is built to withstand all riding conditions * Six LED lamps provide 50 lumens of brightness with 30 degree primary beam angle - 80 degree secondary beam angle * Fits all handlebar sizes (22mm - 32mm) * Battery life: 50 hours steady beam, 100 hours flashing - 3-AA batteries included