Rock BROS Bike Tail Light Rear Bike Light Back Bicycle Tail Light Rechargeable Smart Bike Brake Light Back Braking Sensing Lights

works perfectly so far.

Excellent

Great lights with a built in accelerometer and a light sensor. This 2 features are amazing since I don’t need to be turning the lights in or off. During the daytime or under very bright conditions the lights remain off unless I select the always in mode. But once the light sensor detected low light conditions (night time, shadowed areas or low I luminary’s area) the lights turn in automatically. Also. When no movement detected they turn off after a few seconds. All this helps to save battery life.Only problem I had is the limited mounting options, the mounting brackets are good quality but it only allowed me to place the lights in a limited amount of ways. I would definitely recommend this lights but make sure they do work for your mounting plans before buying them. Performance wise they are great.

Very cool looking light with a nice mounting system, but absolutely lacks minimum brightness level requirements for a tail light. Not safe for night riding.Ring form and mount is very nice - aesthetically really couldn't be better. This is what a tail light should look like!BUT1) Brightness, or lack thereof: The type of nearly disposable tail lights powered by AAA batteries you get as a free handout during Bike-to-Work days are brighter than this light in its normal ("non-brake sensing") state. This fact makes this light unusable as a tail light for safety purposes. As an indication of how dim this light is, I wouldn't feel comfortable with this as a tail light riding on our 25mph residential streets near a park where pedestrian and bike traffic is common and expected by drivers. Now...when brake sensing / vibration brightness is activated it's about where I'd want brightness to be all the time for safety purposes....but unfortunately there's no way to force the brake light to stay in that fully bright state all the time.2) Brake Sensing is a joke: The "smart" brake sensing feature is a total gimmick. As far as I can tell, the tail light will go to bright mode when vibrated in any direction ... which unless you're riding on an indoor track or other extremely smooth surface...means that the light will "sense" you're braking if you hit nearly any type of bump on the road.In summary: While this tail light has all the aesthetically pleasing design characteristics to be great, it utterly fails in execution of being a usable tail light. Even if you could just lock in the bright mode all the time as an option when cycling through brightness modes, that would be a significant improvement. Unfortunately, you can't even do that.

I am the light was a little small so when I got it I was a little disappointed but it was easy to mount and produced a Tonna light and was just great so I got two more I’m really happy with it

I haven't used it at night yet so you're going to have to bear with me on the rest of my response it works well

Fell off while I was riding for no good reason I was on a road wit no bumps also not as bright as I would like