USB rechargeable light, built in 650mAh rechargeable lithium battery for each light. No battery replacementThe Headlight and Taillight feature 4 modes: full brightness, half brightness, fast flashing and slow flashing, switches it as you needAdvanced silicone mounting strap. The strap is elastic enough to fit all kinds of bikes and can be mounted on any part of the bikeEasy installation. The strap can be easily loosen and fasten, and no tools are requiredEasily detached to be used as a bright, tactical or emergency LED flashlightThis small yet bright LED bike light gives you and your family the protection you need whether cruising down a crowded paved road or enjoying the nature in the wilderness. Choose white for the front headlight or red for the rear taillight. 4 Light Mode Options and Discharge Time of Full-charging 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) How to Charge 1. Attach the micro USB cable to the Bike light's micro USB input port 2. Insert the other end of the cable into either an AC adapter (not included ) connected to a wall socket or an active computer USB port 3. The LED indicator of front light will turn to be green when the front light is fully charged and the rear light has an orange hue when finished Package Contents 1 X Head light (white light) 1 X Tail light (red light) 2 X USB cables 4 X Silicone mounting Strap 1 X Instruction Manual