Be safe out there with Serfas' Seat Stay Taillight. This safety beacon will get you noticed out on the road with a large, super-bright 1/2-watt red LED flanked by 6 brilliant smaller LEDs. Plus, the weatherproof silicone body stretches to easily mount to any tube on your bike. Use a few Seat Stay Taillights for 360-degrees of visibility! This great light has steady, strobe and flash modes, and up to 100 hours of run time from the included lithium batteries.