Strong Visibility: A compact and powerful bicycle tail light ensures that others notice you. It can also be hung/clipped on a backpack for improved safety during night travel. The smart version (optional) automatically lights up after sensing the brakes. Waterproof: Can also be used in bad weather. The 250mAh polymer lithium battery lasts longer, and the Type c charging methods are various. Six lighting modes: (constant light, breathing flashing, slow flashing, fast flashing, rhythm flashing, energy saving flashing) simple button switching, easy to operate. High quality material: Made of high quality ABS, one machine is multi purpose, compact and portable, sturdy and durable. GIFT: The straps are easy to load, quick to load and easy to install, making it the perfect gift for cyclists. Specification: Color: Red Material: ABS Size(LxWH): Approx. 3.5cmx4cmx1.7cm/1.38inchx1.57inchx0.67inch Package Includes: 1 Light 1 accessory 1 USB Cable Note: Please allow slightly errors due to manual measurement and different monitors. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store