Serfas TL-415 Rear Flasher
Serfas’ TL-415 Rear Flasher provides visibility and simplicity. Its three red LEDs can be seen from 500 yards in either the steady or flash mode. Plus, this flasher has an extended burn time so you can leave it on your bike for dependable visibility.
Burn time: 140 hours for steady, 200 hours for flash
Included: 2 AAA batteries