The SeeMee 20 V2 Rear Light is a rear bike light that weighs 18 grams, lighter than the previous model, which suits daily cycling in road traffic. The Optillumin lens projects a bright, soft and uniform red warning light of up to 20 lumens, and that red also shows from the side. What Our Gearhead(R) Experts Are Saying:"On long rides home, the battery ran low and the light switched itself into ECO mode, which kept the red light running the rest of the way. The change happened on its own, so my attention stayed on the road."