Has some pros: consumption, since after mixing 1 part of liquid soap and 2 parts of water, foam forms at the exit. As for branded gadgets, such as xiomi, the side is better, but there is also BUT. Has some cons: branded ones like xiomi have a sealed container with a ready-made soap solution (buy only from, and not cheap), batteries (4 baht per month, a bit too much), and not batteries (more than a month).