Durable USB Rechargeable Battery – Built-in 650mAh lithium battery makes these LED bike lights super bright in the dark. Fully charged in 3 hours and lasts for over 6 hours, so you never have to change batteries again. They can be charged with any device with USB ports (PC/portable charger/wall charger/etc) and have overcharge protection. Absolutely the best USB bike lights for cycling enthusiasts!

Four Light Mode Options -- Both the white front light and the red rear light have 4 light modes: Constant full brightness / Constant half brightness / Flashing strobe / Stroboscopic. By simply clicking the button, you can switch modes as you wish. Light up the road in front of your bike with a bright headlight and alert drivers approaching from behind with the bike's LED taillight, giving you 360-degree protection.

Securely Installed -- Advanced and flexible silicone mounting straps provide great security and hold the USB rechargeable bike light set tight enough to prevent it from falling off even on bumpy roads. Easily detach and attach them without any tools. Fits all types of bikes such as kids' bikes/road bikes. Package includes 2 straps + 2 replacement straps.

Waterproof & Lightweight -- Fully enclosed design to protect the bike light set from rainy days, even the USB port is completely covered, making it convenient to use in all weather conditions. The lightweight and sturdy shell ensures stable performance, which is very important when cycling on difficult terrain.