Meet the Defender bike light - the theft-proof, weather-proof, city-proof aluminum headlight that locks onto your handlebars for years of urban riding. Just attach it to the handlebars and forget about it. Dodging drivers, braving rides through the pouring rain and skillfully maneuvering around pedestrians, you do what it takes to reach your destination. You trust your bicycle to withstand your unforgiving daily commute and at night you need something equally as dependable to be seen. Headlight fits all handlebars sized 22mm - 32mm. Six LEDs provide 50 lumens of brightness with a 30 degree primary beam and 80 degree secondary angle. Included 3-AA batteries provide a runtime up to 50 hours on steady beam and up to 100 hours flashing. Weight: 232-grams; dimensions: 10 by 42 by 80-mm.