Question: Could I hook up two Zappers at the same time and run two different programs. Please advise. Thanks. Answer: It is possible to run 2 zappers at the same time on one person, however the different frequency bandwidths may cancel out one or both of the frequencies. Similar result to Noise Cancellation on some more expensive headphones, where the headphones produce and send out a frequency to cancel the outside (Frequencies) noises. Also, frequencies add so it may change the frequencies themselves, I don’t think it’s a great idea, but it can be done.