Live outside USA? You will probably use a different voltage. The factory installed TRULY HEAL PEMF dual voltage switch allows you to use the device in all parts of the world.
You can use the device in UK and Europe while on holiday and then take it back home to USA or Canada and keep energising your cells with a flick of a switch. Vice versa works as well. This is very useful if you travel a lot and want to take the device with you.