The battery lasts a very long time, at night in breathing mode,
The smart brake works properly, while it goes into standby after 30' of inactivity if I'm not mistaken and resumes operation as soon as it detects movement/vibration.

Overall very high quality (it's not plastic), you are visible from a distance and if you place it under the saddle it adds a nice look to the bike.

Very good. You set it to automatic and never have to turn it on and off. It has various programs. It also detects braking and increases the light. I would say the battery is average.

It does what it says in the description.

Quality construction, the lighting is sufficient. It has a motion sensor that allows it to light up more intensely when it detects deceleration, helping those behind you understand that you are braking. It has several lighting functions such as flashing, steady, and pulsating at 2-3 light intensities for each function. It also has the ability to adjust the intensity of the light according to the surrounding light.

I would also like to add that it is securely attached under/inside the saddle, utilizing its rails, and visually it is much more attractive than rear lights that are attached to the seat post. However, inside the box, there is also an accessory for attaching it to the seat post.

It is worth its money, I recommend it!