Knog Blinder 1 LED Rear Light Features : Intergrated USB Plug : Designed to be hidden from the elements, the plug is also waterproof. Battery : Rechargeable lithium polymer battery via integrated USB plug. Burn time : Burn time of over 2 hours in constant and up to 11 hours eco-flash mode. LEDs : Super-efficient LEDs are designed to provide maximum brightness levels for 90% of the battery burn time, making it burn for longer. Lens : Optic design for a balanced ratio of beam width and distance, helping to safely illuminate the path ahead. Visibility : The light is visible at over 500 metres. Battery : Rechargeable lithium polymer battery via intergrated USB plug. Burn time : Burn time of over 2-hours in constant and up to 11-hours eco-flash mode. Storage mode : Storage mode provides the best longevity for your Blinder light. You should repeat this procedure every 3 months thereafter if the light isn't being used. Charge the light for a full charge cycle (indicator glows green when charged) Remove light from USB charging device / port Turn light on in any mode Hold button down for more than 5 seconds, at which point the indicator LED will turn red. The light itself will remain on until the Blinder switches itself off and into storage mode. Bike attatchment : Tool-less attatchment for handlebars and frames of 22-32mm. 100 % Waterproof : The Blinder 1 is IP66 tested and 100% waterproof against all elements. Testing : The Blinder 1 has been drop tested, corrosion tested, UV tested, Electrical shock and static tested, Impact tested and CE Certified.