Durable USB Rechargeable Battery - Built-in 400mAh lithium battery makes these LED bike lights super bright in the dark. Fully charged in 3 hours and lasting over 6 hours, allowing you to avoid unnecessary battery replacement forever. They can be recharged with any device featuring USB ports (PC/ Portable charger/ wall charger/etc) and include over-charge protection. Absolutely the best USB bike lights for cycling enthusiasts!

Four Light Mode Options -- Both the white front light and red rear light support 4 light modes: Constant Full Brightness / Constant Half Brightness / Blasting Flash / Stroboscopic. By simply clicking the button, you can switch modes as you wish. Light up the road ahead of your bike with a bright headlight and call attention to drivers approaching from behind with the bicycle LED taillight, giving you 360 degree protection.

- Color: Red, white.

- Material: Aluminium alloy, Plastic.

- Size: About 4.5 * 4.5 cm/ 1.77 * 1.77 inch(L*W).

- Features: 4 Light Mode Options: Full brightness, Half brightness, Slow flashing, Fast flashing.

- Discharge Time of Full charge.

- Head Light: 3.5hr (full brightness) ,10hrs (half brightness), 10.5hrs (slow flashing), 10hrs (fast flashing).

- Tail Light: 2.5hr (full brightness) ,9hrs (half brightness), 9.5hrs (slow flashing), 9hrs (fast flashing).

- Battery: 650mAh rechargeable lithium battery.

- Waterproof: IPX4

- USB rechargeable light, built in 650mAh rechargeable lithium battery for each light. No battery replacement.

- The Headlight and Taillight feature 4 modes: full brightness, half brightness, fast flashing and slow flashing, switches it as you need

- Advanced silicone mounting strap. The strap is elastic enough to fit all kinds of bikes and can be mounted on any part of the bike

- Easy installation. The strap can be easily loosen and fasten, and no tools are required.

- Get riding safely. Guide the way with the headlight and need not worry about being knocked over by others with the taillight.

Packing: 

2x bicycle lights 

2X USB cables

2x Attachment Strips