shieldgreen Earthing Therapy-Earthing Blanket-Modern Dot, Stainless Steel Yarn 25% EMF,RF shileiding Fabric+Earthing snap for grounding Washable High Shielding Stainless steel wire fiber(No metal plating, No nano metal & heavy metal pollution) / Made in Korea Blanket for EMF,RF Shieling and earthing snap for simple grounding Shielding side:Eco-friendly Stainless steel wire fiber(25%)+Cotton(41%)+Polyester(34%), Other side: High quality compact cotton Size: 38x30 inches(93x73cm) /Earthing Blanket+Included earthing snap. Multi-tester are sold separately. If you need an earthing snap other than the USA , mail to Shieldgreen This blanket does not shield magnetic field. It does not block all the frequency bands of the phone but reduces the signal. Shielding performance Max 99.99% (1.5GHz) /Shielding: LF(Low frequency electric fields) &amp; HF(High frequency electric fields) This blanket does not shield magnetic field. It does not block all the frequency bands of the phone but reduces the signal.