The SeeMee DV Camera Rear Light is a rear bike light with a built-in camera, so one unit on the seatpost warns traffic and records the road behind. A 30 lumen red light warns traffic and shows from the sides as well. What Our Gearhead(R) Experts Are Saying:"On after-work rides, loop recording kept the camera running through every commute on one card. The accelerometer locked the clip around a sudden jolt, so that footage stayed saved while the loop kept going."