This bycicle taillight with 5 superbright LED indicators and 2 red beams is great for cycling at night or in places where visibility and safety are a concern. Simply mount the quick-release mount on the bike tube. With waterproof design, it makes your riding freely regardless of rain. Can be easily installed on the bike tube to bring some enjoyment to your cycling and increase the safety. Features - - Material: PVC. - Size: Approx. 8.3 x 7.3 x 3.3cm/ 3.3 x 2.9 x 1.3 inch (LxWxH). - Power source: 2 x AAA battery(not included). Can work lasting about 12 hours. - mount fits approx. 20-36mm diameter tubes. - With 5 superbright LED indicators and 2 beams design, easy to be noticed at night. - 2 modes: steady on and flash. - 7 LED modes: steady on, fast flash, slow flash, right to left flash, left to right flash, fast and forth slow flash. - With an adjustable clamp, easy to install and remove. - for camping, cycling, etc. Package list: 1 x Bike Tail Light 1 x Mount