Describe: 1. Material: high-quality ABS+PC material, anti-drop, scratch-resistant, long service life. 2. Wick: Multi-light source lamp bead design, equipped with LED+SMD lamp beads, high brightness, pure color rendering, long life and stable light source output. 3. Charging method: diversified USB charging system, compatible with multiple charging methods, convenient and practical. 4. Illumination mode: 5 levels adjustable (main light: white light strong light/white light low light; secondary light: red and blue flashing/white light strong light/white light weak light) The light can be changed according to different use environments, which is easy to use. 5. One light for multiple purposes: This product can not only be a bicycle taillight, but also can be used as a helmet light, backpack light, shoulder clip light, running light, night running light, warning waist light, etc., which can meet multiple purposes at one time and is convenient and practical. . 6. Suitable for: running, fishing, cycling, climbing, dog walking, patrolling and other outdoor scenes. Specification: Name: USB rechargeable red and blue warning light bicycle tail light LED shoulder clip light helmet light Colour: Black Lamp beads: LED+SMD (red/blue) Charging method: USB charging Use battery: built-in polymer lithium battery Battery capacity: 800 mAh Charging time: 3 hours Working time: 1-2 hours Lighting mode: 5 levels adjustable (main light: white light strong light / white light low light; secondary light: red and blue flashing / white light strong light / white light weak light) Waterproof grade: life grade waterproof (not immersed in water) Maximum range: 100-200 meters Size: 7*2.5cm Gross weight: 43g Type of packaging: Package A: 1*tail light, 1*buckle, 1*banding, 1*charging cable Package B: 2*tail lights, 2* buckles, 2* straps, 2* charging cables Notes: 1. Due to manual measurement, please accept an error of 1-3 cm. 2. Due to the difference of light and sn, the color of the product may be slightly different from the picture.