We have rats, mice, and possums in our house, and we recently came across an ad for electronic pest control, advertising a gadget costing NZ$159.99 which plugs into mains power and apparently gets rid of mice, rats, and cockroaches in an area up to 150sqm. The ad claims the device sends "short 'pulses' of electromotive force through your home's electrical wiring that drive pests from their hiding places and out of your home". They have a 60-day money-back guarantee, and claim the unit will last more than 10 years. Has anyone here used this? Can you recommend it? And what on earth is "electromotive power"?