5 LIGHTING MODES: The Headlight and Taillight feature with 5 different lighting modes depending on your preference, include full brightness, half brightness, SOS, fog light+warning light, led+warning light. Anti-dazzle design for prevent accidents, foglights for foggy or rainy days using, 10 COB red light beads on both sides for warning effect. ATTACHES IN SECONDS: The mount straps for both bike headlight and taillight can tightly fit around most handlebar and size seat posts. Easy and quick to install and release. No tools are needed.The headlight and build-in horn have a two-in-one switch,very easy to control. MULTI-FUNCTION: Bike light comes with speed meter/horn (130db, 5 modes)/battery status/anti-theft alarm function, is versatile enough for cycling, hiking, camping, or any outdoor activity and can be used as emergency flashlight, personal alarm, greatfor cycling at night or in places where visibility and safety are concern. Rechargeable and Waterproof Bike Light: This LED bicycle headlight has a built-in 1200mAh battery for 3.5-6.5 hours riding, with accurate battery indicators(100%, 75%, 50%, 25%), super waterproof, let you enjoy a carefree trip