Then I had to spend several minutes (like 20) with that booklet on the left setting up the electronics in it! It "talks" to a Smart Guide mounted on the wall. Jeeze, if I'd known that I might not have bought this one! At my age I don't think I need stars for brushing my teeth! On the bright side it does a whiz-bang job of getting the teeth clean! I mounted the gizmo on the inside of a door so I don't have to look at it, then when it runs out of battery juice I won't replace them.
This is right up there with the iron I had to read the instruction book for!