Using new Chip On Board COB technology the Blinder Rear Bike Light produces a punchy 100 lumens and is brilliant for attracting attention on the road or trail in all light conditions. Blinder is one of Knog's most individual rear bike lights ever adding serious personality to you ride. Features:   Easy On Easy Off - Blinder comes with a tool-less removable silicone strap for seat posts 22 – 32mm in diameter. Mounting is incredibly simple and using silicone straps means there’ll be no chance of damaging your bike Charge Indicators - When your Blinder is running low on battery a red LED will light up next to the button. This ring will turn green and then turn off once the Blinder is fully charged Integrated USB Connector - No charging cable is required. Blinder's integrated USB-A connector plugs directly into USB ports and charges in just 4 hours Blindingly Bright - With 100 lumens of output Blinder is a seriously bright option for any cyclist. Efficient Chip on Board COB LEDs provide maximum brightness for up to 90% of the battery burn time Specification:   Bulb Type - Chip On Board COB LEDs Light Output Max - 100 lumens Run Time - Max Steady: 2.5 hrs Eco-Flash: 55 hrs Charge Time - 4 hours Waterproof - Yes IP67 Rating Light Modes - 8 Fits Handle Bars - 22 - 32mm+ diameter plus head tubes to 7.9 inches Rechargable - Yes integrated USB-A connector Dimensions - H: 43 mm x W: 43 mm x L: 46 mm Weight - 34 grams Low Battery Indicator - Yes Strap Material - Medical Grade Silicone Operating Temperature - -20 to 50 °C / -4 to 122 °F Optimum Charging Temperature - 20 to 22 °C / 68 to 72 °F Room Temperature.