ADVANCED DESIGN: USB rechargeable front and back lights, built in 2000mAh rechargeable lithium battery for Headlight and built in 330mAh rechargeable lithium battery for Taillight.FOUR LIGHT MODE OPTIONS: The Headlight and Taillight feature an one-touch switch with four different lighting modes depending on your preference. Include full brightness, half brightness, fast flashing and slow flashing.EASY INSTALLATION: The Headlight is equipped with a mounting bracket that can be easily fixed to the handlebar. The silicone mount strap for Headlight and Taillight are designed with four openings that tightly fit around most size seat posts. Both Headlight and Taillight can be easily loosen and fasten, and no tools are required.MUTIFUNCTION: This bike light set is versatile enough for cycling, hiking, camping, or any outdoor activity and can be used as emergency flashlight. This is great for cycling at night or in places where visibility and safety are concern. So, just start your next adventure with us.BUY WITH CONFIDENCE: committed to providing our customers with high quality products, we are dedicated to ensuring your fully satisfaction. Please contact us when you have any problem, we will solve the problem for you as soon as possible.4 lighting modes- Waterproof, can be used in the rainy day- Super bright with max brightess up to 300 lumens- Lightweight design, easy to carry and storage- Flexible rubber strap design for fitting most handlebar4 Light Mode Options and Discharge Time of Full-chargingHeadlight: 5hr (full brightness) ,10hrs (half brightness), 6.5hrs (slow flashing), 12hrs (fast flashing)Taillight: 9.5hr (full brightness) ,16hrs (half brightness), 10hrs (slow flashing), 11hrs (fast flashing)USB Rechargeable bike light charges from your computer, wall charger or any device with a USB port using the included micro-usb cable.How to Charge1. Attach the micro USB cable to the Bike lights 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 both front and tail light have a red light when charging and the LED indicator will turn to be green when finished charging.