Personally, we don't have much of a need for this device, as counting up to four isn't really that much of a struggle. But if you're the exercising sort, or more likely, if you're in the market for an interesting and quirky Japanese Christmas present for someone so you look all interesting and quirky, the Push-Up Counter might well be your 'thing'.
You just bop your chin on the big red button. That adds one to the counter. There are no other features. It is not also a camera and it plays back zero movie formats. The beauty is in the simplicity.