Installed in the company toilet. It runs on AA batteries and was easy to install. Sometimes it doesn't respond and there is no sound, but I think it's acceptable. If you drop it, it will break immediately. There is no problem with the volume. (Translated by machine.)
It's a reasonable price, but it's a non-contact type, so it's enough. It is recommended to fix it firmly so that it will not fall and break. (Translated by machine.)