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!

The V stands for velocity and this tail light detects changes in riding speed and alerts surrounding traffic. - High output surface mounted LED plus 2 5mm LEDs provide steady, Courtesy & Superflash modes and V burst - Velocity Variation Technology accelerometer detects changing ride speed and alerts surrounding traffic with a four second burst of light (25 lumens) - Run times: 6 hrs (steady – 8 lm), 9 hrs (Courtesy - 3-7 lm) and up to 40 hrs (Superflash - 8 lm) - Provide 180° of visibility - Water resistance rated to IPX6 standard - 270 mAh Lithium polymer battery charges in 2.5 hours with micro USB cable (included) - Smart Charging Technology™ with built in low battery indicator - Includes seat post and seat stay mounts and clip mount for multiple mounting options - Mount it to your rear rack with the Rack Bracket (#3108) - Highly visible, even in daylight - 54 grams