Feature: 1. Super light weight, not cumbersome, compact and portable, will not bring burden to your bike. 2. High brightness energy‑saving LED lamp, brightness up to 15lm, less power consumption. 3. Made of high quality nylon material, firm and durable, not easy to break, provide longer service life. 4. The function of a variety of flashing lights, improve visibility in the dark, night ride more worry free. 5. Durable polymer lithium battery that lasts up to six hours on a full charge, more convenient to use. Specification: Item Type: Bicycle Tail Light Material: Nylon Weight: Approx. 33g 1.2oz Battery: Built in 120mAh polymer lithium battery (shipped with built in battery) Mode: long press the button for about two seconds, slow flash cycle, press again, quick flash cycle, press again for super flash, again for the constant light, long press two seconds to turn off the light body Power Description: the charging time is about 2 hours, the longest use time is 6 hours, slow flash: 5 hours, quick flash: 5 hours, constant bright: 3 hours, super flash: 4 hours. Package List: 1 x Bike Taillight1 x USB Cable2 x Rubber Ring