Grab this super bright 1 watt bike headlight/flashlight with telescopic function. That means you can zoom in or out with the lens. You can either zoom in and concentrate a powerful beam of light on one area, or zoom out and spread the light over a large area. This is a function usually found only in very expensive flashlight models. Takes 3 AAA batteries, included. It has 3 modes: Full brightness, low brightness, and flash. Use full power when you need to light up the road in front of you. Low power is best if you wish to conserve battery power and the road is fairly lit. Flash mode is best to grab the attention of motorists and conserves battery power even further.