If you have Panasonic Cordless in your home or office this is a thing for you. Youcan use this to extend the range of your phone to wider area, effectively doubles the reach .Good for multi storied buildings or dead spots. Good for Cordless Dect 6.0 or later. Bought in the United States. As part of cleaning my house I am selling unused items from my home at very cheap price. I mostly live in the United States. This has remained unused, so this is of no use to me.