Knog Plus is a bright, 100% waterproof and versatile USB charging light for bikes. Attach it to your handlebars or fork, or use the built-in clip to attach it to your jersey pocket (or backpack strap, bike pannier) and you're ready to go. If you're more of a runner than a cyclist, simply slip the flasher behind your shirt, shorts, socks or headband using the integrated clip and you'll have enough light to illuminate you at night. Weight 12g Front 40 lumens / Rear 20 lumens Lifetime 2/40 hours 5 USB modes Magnetic fastening Universal fastening on bike, helmet, dog collar, t-shirt, stroller, backpack strap .