The LED light set mounts quickly onto bicycle handlebars and seat posts. Great for cycling at night or in places where visibility and safety are a concern. Visible to motorists over 1500 feet away. The headlight has 5 LEDs that can light up roads for over 40 feet and features a toolless handlebar mount. Once mounted it has a quick-release system for removing the headlight from its mount. Cut-away design allows light through the sides for more visibility. The taillight is angle adjustable and removable from its seat post mount with a clip-on quick-release system. Fits most handlebars and seat posts (rubber sizing shims included). Up to 80 hours! (Batteries not included). Note: Headlight batteries, body, and cover must be aligned correctly in order to work. Align the power button on the battery holder with the power button on the headlight body. Align the arrow (on the clear plastic portion of the cover) with the open/close marks on the body).