The ball is in two parts: the top is composed of absorbent fragrant gravel, down collects water.
It requires no electricity in the manner of a diffuser!
After 4 days, the transparent bottom is filled halfway with water, proving that it works perfectly.
By cons, it is short, to really use transiently because it is not rechargeable.
I advise you AERO RUBSON of the same brand, which has rechargeable pellets, which runs on 25m 2. I will soon buy it, and I will table an opinion to share my impressions, but I am sure that it is very effective.