Knog Plus is a very bright, 100% waterproof and versatile USB charging light for bikes. Attach it to your frame under your saddle or use the integrated clip to attach it to your jersey pocket (or backpack strap, bike bag) and you're ready to go. If you're more of a runner than a cyclist, simply slide the blinker behind your shirt, shorts, socks or headband using the clever integrated clip and you'll have enough light to illuminate yourself at night. Weight 12g Front 40 lumens / Rear 20 lumens Life 2/40 hours 5 USB modes Magnetic attachment Universal attachment to bike, helmet, dog collar, T-shirt, stroller, backpack strap .