"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. Specialized Flashback Taillight in Black"