I disagree with Petiot

It is not super easy to use with its 2 blue and red LEDs, but does not require either of having bac +5 to learn to use its single button.
After an adjustment period, it is incredible autonomy, and does the job very well.
Only downside, the risk of inadvertently support and set off, but as I place it in a sealed box, it does not happen in these conditions.