Review on XTAUTO 5-LED Car Door Warning Light - Universal Wireless Safety Light for Anti Rear-End Collision (Blue) by Dustin Marshall

Relatively small (as you can see in my photos) about the size of a quarter. So far I'm very happy with them. to see how they turn it into a thin LED strip that attaches to the door with a magnetic switch. for cars coming from behind. In my video you can see I have it on my car but after a few minutes of trying I think the battery is dead. I will buy 1 to see and hopefully the light isn't gluttonous and doesn't eat batteries. Update 3.4.21 So I replaced the battery with another one and it seems to be working fine. door, it didn't quite work on the edge where it would have been best. I just had to put it on the inside of the rubber door seal near the striker. For some reason it didn't work on the other side. I also had to contact Revain cs for a replacement as one of the 'washers' didn't work. One of the circuit connections was incorrectly soldered. It would be nice if they did something like this in the shape of a triangle for the trunk with a switch so it can be turned on at night, or so that it turns on with a gravity switch. Trunk is open. Update 04/10/21 Well, I think the batteries are dead. Not sure. I checked them with a multimeter but they read 2.98 volts. Maybe manure washers? I'll look for brand new batteries. Update from 04/17/21 So after about 2 weeks and brand batteries everything seems to be fine. Apparently the supplied batteries are not very durable. I accidentally broke one of the washers that didn't match the tailgate jamb, but misplaced it and replaced the lens with one from the spare order. Update from 18.04. I think the washers are too thick for my car. I just got out and found another red lens broken. This is on my doorstep. Maybe a magnet will strike when I close the door. You really need to design it to use a thin LED strip to prevent this.