LEWSHQI Airtag Bike Mount, Cycling Taillight GPS Units Hidden Bike GPS Holder for Airtag - Bicycle GPS Tracker Light for Night Riding/Theft Safety Hidden Smart Bicycle Rear Light

I really like this light, but there are a few weird things about it. It has several different patterns to choose from, but too much use of yellow instead of red in the patterns. Maybe this was designed for maximum contrast with the solid red that shows when the device senses braking. I can't honestly say how well that feature works, BTW, because I've only been able to use it a few times, and I can't really see my own tail light. Still, the controls are easy to use, it's plenty bright, and it's motion-sensitive so I don't have to remember to turn on/off. It was also easy to attach to my seat post. All in all, pretty solid device that I am glad to have ordered.

While I have yet to put the light on my bike, there are some really cute patterns available, and as you can see, it's VERY bright. It is easy to use, by just holding the button 3 seconds to turn on, then pressing repeatedly to rotate through the options to find the one you want.After this, it gets a bit confusing, as you need to hold for 2 seconds to put the light into smart mode, if you wish. The 2 second press is a bit difficult for me to get just right. What is easy is to leave it in the constantly "on" state. While the directions have English, it is a bit difficult since each section includes both English and what I believe is Chinese.There is a thick rubber seal within each mount type, so you simply remove it and insert your Airtag, then replace the rubber cork. Since there is no evidence of the Airtag holder (with it being hidden inside the mount), it is unlikely a thief would even know one is there. And, to get to it, you would have to remove the entire mount from the bike. Great design for camouflaging the tracking device.Since it's not yet on my bike, I cannot test the brake functionality in "smart" mode. The light comes with mounts for the seat post as well as the seat frame, and a rubber bar to attach them. And, as there are many holes, getting a tight fit is assured.