Style Basic Speedomoter Battery 1200 mAh 1200 mAh Lumens 300 300 Usb Charger Yes Yes Power Play Yes Yes Work Time 3-6 Hours 3-6 Hours Siren Yes Yes Bike Speedometer No Yes Description: Name: Bike Light Set with Speedometer Material: ABS + GPPS Size: about 101.5*49.5*24.5mm Lamp beads: XPG+COB+2835*2 Main light/fog light: 300 lumens/30 lumens Battery capacity: 1200 mA (3.7V) lithium battery Waterproof rating: IPX4 Range: 50 - 150m Feature: 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, fog lights 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, great for 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! About smart Siren Long press the main buttoon for over 3 seconds,you will hear the [didi sound 4 times],5 seconds later,if the bicycle is subject to some extent of vibration,it will initiate the alarming sound for 15 seconds,if being vibrated again,it will sound with the secound kind of alarming sound ;long press the main switch to turn off the alarming sound function.