Advanced design. The rear light is equipped with a 330 mAh rechargeable lithium battery. It comes with a charging cable that can be charged from your computer, power bank or any device with a USB port. Four light modes: The rear light has a one-touch switch with four different lighting modes, depending on your preferences. Including full brightness, half brightness, fast flashing and slow flashing. Ease of Installation: With a convenient one-touch disassembly button, all you have to do is slide the light on and off the bracket without removing the entire bracket. The silicone taillight strap has four openings that fit snugly on most handlebars and seat posts. Driving safety: The taillight emits an eye-catching wide-angle beam that can be seen from blocks away. You dont have to worry about others being mugged. Buy with Confidence: Committed to providing our customers with quality products, we aim to ensure your complete satisfaction. Please contact us if you have any problem, we will solve the problem for you as soon as possible. Product descriptions 4 light modes and discharge time when fully charged 9.5 hours (full brightness), 16 hours (half brightness), 10 hours (slow flashing), 11 hours (fast flashing). How can I charge 1. Attach the micro USB cable to the micro USB input of the bike light. 2. Plug the other end of the cable into either an AC adapter (not included) that is plugged into an electrical outlet or a USB port on the Actve computer. 3. The LED indicator of the taillight will have a red light when charging and the LED indicator will be green. Package content: 2 x taillight (red light). 2 x USB cables. 2 x silicone tape for taillight. 1 x instruction manual (in English).