Knog Plus Twinpack is a set of Knog Plus front and rear turn signals. Knog Plus Free is a bright, 100% waterproof and versatile USB rechargeable light. Clip it under your saddle, on your seatpost, or use the integrated clip to attach it to your jersey pocket, backpack strap or bike pannier.Are you more of a runner than a cyclist? No problem. The Light Plus can be used for night lighting. Simply slip it behind your shirt, shorts, socks or headband using the clever integrated clip, and the flashlight ensures visibility for all athletes, day or night. Weight: 12 g Brightness: 40 lm front / 20 lm rear Battery life: 2 / 40 h 5 USB modes Magnetic clamp .