These toilets are advanced automatic affairs but the advantages are outweighed for some by their operation. Many consumers or users had become sprayed by water when they pressed one of the many buttons on the back panel in an attempt to flush. Often, if not usually, there's a handle - old fashioned - or perhaps an automatic flush sensor.
So it seems unwise to investigate the buttons. Ther may be instructions in English, but more often there are icons and Japanese instructions. Beware of the word oshiri which is a bottom wash, to act instead of toilet paper. This is not supplied so you should carry your own.
Japanese automatic toilets are usually set up with a sensor that allows for a person to be able to flush the toilet by simply waving their hand in front of the sensor. Japanese automatic toilets are usually bidet style which means there is no paper but most of the time paper can be found in the stalls where these automatic toilets are. Some Japanese automatic toilets have English translations with them but it is always a good thing to have some basic knowledge of reading Japanese before entering one of the automatic toilets. There are all kinds of selective features that come with a Japanese automatic toilet such as adjusting the water pressure of the bidet and a drying function after you are done using the toilet. Japanese automatic toilets can be found at all kinds of public places and train stations all throughout Japan. Japanese automatic toilets are certainly nice and convenient but the best thing is being able to understand written Japanese so you do not push any buttons that you did not intend to in the first place.