Long-lasting USB rechargeable battery – Built-in 650mAh lithium battery makes these LED bike lights super bright in the dark. A full charge takes 3 hours and provides over 6 hours of use, so you never have to replace the battery. They can be charged using any device with a USB port (PC/portable charger/wall charger, etc.) and feature overcharge protection. Absolutely the best USB bike light for cycling enthusiasts! Four lighting mode options – The white headlights and red taillights support four lighting modes: constant full brightness/constant half brightness/flash/strobe. Simply click the button to switch modes as desired. Illuminate the road ahead with bright headlights and use the LED taillights to alert drivers approaching from behind, providing 360-degree protection. Securely Installed - The advanced, flexible silicone mounting strap provides security, securely holding the USB charging bike light to prevent it from falling, even on bumpy roads. Loosen and tighten the straps easily without tools. Suitable for various bikes, such as children's bikes and road bikes. Waterproof and Lightweight - The fully enclosed design protects the bike light pack from rain, and even the USB port is fully covered, making it easy to use in all weather conditions. The lightweight yet robust housing ensures stable performance, which is crucial when riding on challenging terrain.