Commuting calls for a rear bike light that goes on and comes off fast, and the Magicshine SeeMee 50 Pro Rear Light uses a magnetic mount that snaps onto the seatpost and pulls free again at the end of the ride. A lockout function keeps the switch from triggering while the light rides in a bag, which protects the rechargeable battery between commutes. Dual-direction magnets hold the light horizontally as well, so a rear rack works as a mount. What Our Gearhead(R) Experts Are Saying:"On dusk commutes, the strip lens spread the 50 lumens into a wide red line that traffic behind me picked up early. It stayed easy to spot through drizzle on the ride home."