I've got the old handheld zapper, not one of those fancy ones. It's got the two copper handhelds you wrap a wet paper towel around and flip the switch. Little red light comes on and I walk around for 7-10 minutes. You can spend a lot of money on those. Clark invented it, well actually her brother. Works like a charm. Great for colds flu's sinuses, lungs, any virus or bacterial infection.