The Carbon+ Home EMF Harmonizer Single is used for one of two purposes:
To supplement a Carbon+ Home EMF Harmonizer Kit if the area to be covered is greater than 4,800 square feet. In such a case you should order the Kit 4800 and one of the Singles for each additional 400 square feet.
To create a protected area in your home, apartment, or office when you don't have access to the fuse box. In such a case you will order a minimum of 4 of the Singles for an area up to 1,000 square feet and an additional Single for each additional 375 square feet.