Put this little bright spot anywhere-your seatpost, your backpack, your belt-and ride on. The Flashback is your go-to savior, packing a mighty "I&';m here!" punch to keep you visible on the streets. The simple o-ring mount takes a split second to install or remove on a round seatpost. With its belt clip, you can clip it on just about anything, and its compact size makes it a total no-brainer for keeping your ride safe and your street-cred high. Compact, bright, and waterproof. O-ring mount (extra o-ring included) fits all round seatposts. Built-in fabric belt clip makes it a clip-anywhere taillight option. 200mAh battery recharges via included micro USB cable in 2:00 hours. IPX7 waterproof means this light will be there when you need it, even in the hardest rain. Tested and approved for the following Specialized helmet models: Align, Ambush Comp, Chamonix, Propero II, Echelon II Steady mode: 10 lumens for 2:00 hours Power Flash mode: 20 lumens for 4:00 hours Disco Flash mode: 14 lumens for 6:00 hours Eco Flash mode: 5 lumens for 20:00 hours