Description： Origin: Mainland China Material:Silicone,Resin Size:11cmx2.6cm/4.3"x1.3" Lighting Mode: Always On, Flashing Battery Model: CR2016 Waterproof Rating: IP6 Package Included:1Pc x Helmet Light Features: 1.Excellent Durability: The Recognition Helmet Flashlight operates in Two Modes, including Normal Glow Mode And Flashing Mode 2.Easy to use: you Can Hang your Flashlight From your Backpack, Attach it To your Helmet, Attach it To your Bike Seat, or Drape it Around your Neck. 3.BOOIU Tactical signal light with two modes of operation: always on and flashing. Built-in CR2030 button battery, working for about 100 hours. 4.GOOD QUALITY - BOOIU Helmet Flashing Light be made from good quality silicone and gel which with good sealing (waterproof) and flexibility. The product could works well in an environment from -20 ° C to 50 ° C. 5.POWERFUL FUNCTION - This tactical signal light is an essential item for your outdoor activities, such as cycling, hiking, hunting, diving. You can stick it on your tactical helmet, hang it on it on your backpack, stick on your bicycle seat or hang on your neck. 6.ATTENTION - When the battery is exhausted, you can replace the battery by yourself. (But changing the battery will affect the waterproof function of the product.) Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.