I emailed him at: [email protected] and asked about the zapper. He emailed me back a little booklet about how it works and an address to mail a check/paypal link if I wanted to buy one. He also included a phone number if I wanted to call and ask questions. It's not a big operation, he's a retired engineer who built this device (based on Hulda Clarke's plans) for his wife when she was sick, and it evolved into a side-business.