Review on 🚴 BikeSpark G4R Auto-Sensing Rear Light – USB Rechargeable (240HRs) – Precise Brake Sensing – Cargo Rack Compatible – 50-lumen Brightness – Large Reflector – 50/80mm Screw Mount/Easy Release – Made in Taiwan by Troy Arnold

I was looking for a light that could be mounted directly on the trunk for my daily commute. It's very reliable and bright. I like the auto power off feature. I don't have to remember to turn it off when I go to work or home. I don't know about the claim that it should get lighter or anything like that as you slow down because there's no way of knowing when you'll get rid of it. I might need someone to ride behind me to see how it works. Battery life seems normal, I've been using it for a week now and it's still working. I suspect it will take much longer. I want you to buy a different mount so I can switch between bikes. Guess I just have to buy another one.