It's essentially a handheld air cannon. The kit comes with a handle and a suction that covers the toilet hole or whatever. You press down and yeah...it's basically a air-gun shot to the clog.
And yeah. It works great. Not always on the first blast. But I've never had it fail me.
Ha ha. No no. I'm pretty good. No problems with the old downstairs plumbing. But it's not just for toilets. It's for bathtub sinks clogged with hair. Kitchen sinks, etc... It's just handy to have around the house. I even used it once to blow the dust out of my dryer vent.