Topeak RedLite UFO

Topeak's RedLite UFO mounts on seatposts, seat bags and seatstays. Its 4 super-bright yellow LEDs and 6 red LEDs shine through a 270-degree, wide-angle, reflective lens to alert traffic approaching from almost anywhere. The RedLite's watch-style lithium batteries (included) offer 60 hours of burn time. Plus, you can choose from a constant, blinking or cool cruising mode.