This is a handy safety device that locks into a socket integrated into the back of some of Lazer's helmets, including the Vento. A socket on a velcro strap is included for mounting it on many other helmets, including Lazer's G1. Useful flash patterns, including motion-sensing on the daytime-flash option. And the control button has a clever flexible cover to keep the unit waterproof.
(1) For daytime use, brighter would be better, say 80 rather than 40 lumens. Replace the 4 10-lumen LEDï¿½s with 20-lumen ones? Flash patterns could be adjusted to avoid decrease in battery life.
(2) Lazerï¿½s use of a magnetic charging connector (rather than the usual micro-USB-with-a-cover) is a clever way to make the unit waterproof. Unfortunately the connector button seems to be glued to the unitï¿½s case. I had to get a replacement unit because the button came off. If the case had a slot that the buttonï¿½s flange slid into before gluing, this would not happen.
So 4 stars until Version 2 comes out.