The BV 5 LED Safety Light Set mounts quickly onto most bicycle handlebars and seat posts (rubber sizing shims are included). Great for places where visibility and safety are a concern. Visible to motorists over 1500 feet away. 3 LEDs on each light face forward and 2 LEDs face out to the sides, increasing peripheral lighting. The taillight is angle adjustable. Each light has a quick-release system that makes it easy to remove from its mount when your bike is locked. Prevent theft by taking them with you Clips also attach to gear bags, allowing flexible placement. 3 modes (steady, blinking and fast blinking) help to alert drivers of your presence on dark roads. Up to 65 hours (Batteries not included) Note: When installing the light onto the mount, please ensure that there is a click indicating that the locking tab is in place. Please contact us at 877-985-5888 if further instruction is needed. Specifications for each light 3 modes: Steady, blinking, fast blinking (20 Lumens), Run Time: 30 hours steady, 65 hours flashing (Tested using standard alkaline batteries), Batteries: 2 x AAA for each light (not included), Water resistant: Yes, Mount type: Toolless Headlight (+ quick-release clip), Bracket Taillight (+ quick-release clip), Dimensions (without mount): 2.75-Inch x 1.5-Inch x 1.2-Inch (7 cm x 3.8 cm x 3 cm), Weight (with mount): 1.7-Ounce(48 g).