Are there any dangers from EMF based pest control devices?
Combined EMF and ultrasonic devices seem to be effective at keeping mice away. There are questions about how effective the EMF ones are on their own, without the ultrasonic component. They operate at VLF frequencies and we do not know of any readily available instruments which measure this frequency. They do give off an audible ‘click’ every few seconds in operation but, by and large, it is unobtrusive. EMFs are very low, but we would not recommend placing one of the units next to the bedhead in a bedroom or a chair which is sat in for lengthy periods of time.
