KNOG Blinder Mob FourEyes Bicycle Head Light/Tail Light Twinpack LED- Front 4 LEDs generate 80 lumens for 1200+ meters of visibility, Rear 4 LEDS generate 44 lumens for 800+ meters of visibility 100% WATERPROOF- The Blinder MOB is IP67 Tested and 100% waterproof against all elements INTEGRATED USB PLUG- Designed to be exposed to the elements, and then some. BIKE ATTACHMENT- Tool-less removable silicone straps for bars/posts 22 - 35mm+ diameter. Fits Aero & Oversize bars /posts CHARGE TIME- 4 -5 hours (LED will turn green when fully charged, per light)