Planet Bike's Spok Taillight ensures you'll be seen for up to a mile! It boasts a super-bright LED and a translucent casing that allows 220 degrees of visibility. The rubber strap can be used to mount the Spok on seatposts or odd shaped tubes of all sorts and sizes. And, this little baby runs up to 100 hours with the included CR 2032 battery. There's even a keychain hole for portability!