XIANQI Advanced design: USB charging lights, each light has a built-in 650mAh rechargeable lithium battery.Four Light Mode Choices: The headlights and taillights have a one-touch switch that provides four different light modes depending on your preference. Including full brightness, half brightness, fast flashing and slow flashing.EASY TO INSTALL: Silicone mounting straps are designed with two openings to snugly fit multiple sizes of seatposts, handlebars, seat lifts, backpacks, helmets, and stretch parts to keep lights safe and secure. They can be easily loosened and secured without tools.MULTI-FUNCTIONAL: This bike light set is versatile enough for cycling, hiking, camping or any outdoor activity and can be used as an emergency flashlight. This is perfect for cycling at night or where visibility and safety are a concern. So, start your next adventure with us.Product DescriptionThis versatile bike light provides excellent protection for road or mountain bikers. Not only does it help you see the road, it also lets cars and other cyclists see you.1: Connect the micro USB cable to the micro USB input port of the bicycle light2: Plug the other end of the cable into an AC adapter (not included) connected to a wall outlet or USB port of a powered computer3: When the headlight is fully charged, the headlight LED indicator turns green, and the taillight turns orange when fully charged.Package Contents1 X headlight (white light)1 X tail light (red light)2 USB cables2 X Silicone Mounting Straps