The floor mat is made of RF(Radio Frequency) EMF/EMR(Electromagnetic Fields/Electromagnetic Radiation) blocking fabric. It can block RF EMF/EMR radiation coming from below (lower apartments). It can be laid under the bed or under a carpet. When used with a RF EMF/EMR blocking canopy it closes the Faraday cage.
It comes in two sizes, small (for single bed) and big (for double bed)
It is recommended to tests the RF EMF/EMR levels several times using home use RF meters before buying and using any RF EMF/EMR protection devices. Even after you buy and use the RF EMF/EMR blocking floor mat it is a good practice to test the RF EMF/EMR level every several days.