ADVANCED DESIGN. The Tail Light is built in 330 mAh rechargeable lithium battery. It comes with a CHARGING CABLE that charges from your computer, power bank or any device with a USB port. Water resistant rated to IPX4 - Protected against splashing water from any angle.FOUR LIGHT MODE OPTIONS: The Tail Light 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: With a convenient one-touch dismount button, you just need to slide the light on & off the mount without removing the whole mounting bracket. The silicone mount strap for Taillight is designed with four openings that tightly fit around most size handlebars and seat posts.ULTRA-BRIGHT TO KEEP YOU SAFE: The innovative illumination design around the light casing provides more visibility than any other lights on the market! Whether youre running, walking your dog, cycling, skateboarding, hiking, jogging or changing a tire, these ultra-bright safety lights will keep you safe and secure - a mandatory piece of safety equipment for any low-light activity and a great addition to your outdoor- or reflective gear.SERVICE: We are dedicated to ensuring your 100% satisfaction. Please feel free to contact us when you have any problem, we will solve the problem for you as soon as possible.4 Light Mode Options and Discharge Time of Full-charging 9.5hr (full brightness) ,16hrs (half brightness), 10hrs (slow flashing), 11hrs (fast flashing) How to Charge 1.Atach 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 actve computer USB port. 3.The LED indicator of tail light has a red light when charging and the LED indicator will not display when finished charging. Smart Charging- 2 hour charging time - Automatic, fully charged cut-off system - Smart charging ensures longer battery life Package Contents 2 X Taillight (red light) 2 X USB cables 2 X Silicone mounting Strap for Taillight