I bought it a bit on a whim since there was neither information nor photos available, just because I liked its appearance.
Initially, it is much smaller than I expected! Length 6.3cm and you can see it in relation to my hand. For some reason, I thought it would be much bigger.
It has a clip like a peg that rotates and clicks into place at 0 and 90º, and it also includes an elastic strap to attach it to a tubular spot.
It charges via micro USB (!) which is an old connector. Minus one star just for that since it should have type-c. (the cable is included). The light it emits is purely red. The yellow that appears in photos on the internet is not accurate.
It has 3 brightness levels and I can say it is quite powerful! The packaging says it is 100 lumens. By double-clicking while it is on, it enters 3 flashing modes: 1) slow 2) slow with high intensity 3) low intensity but extremely fast frequency.
All operations are done with the single button it has, with the on/off symbol visible on the front.
I don't have an opinion yet on battery life.
As for build and quality, it seems good at first glance and I hope it justifies the €15.
Edit Oct. 2025: After a few months of use, I have to add that when its battery is about to run out, it starts flashing continuously as if it entered the corresponding mode and does not respond to any function. The first time it happened, I thought it was broken! So, for me who uses it only as a steady light, it gives no warning before it starts flashing like crazy! I don’t know what the designer was thinking.
Regarding battery life, on the low setting it lasts 6.5 hours, on medium 3 hours, and on high just 1.5 hours, so if someone goes on long rides, it might not last even when freshly charged!