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BlocSilver Window 20 EMF Protection Window Film offers great EMF shielding qualities (see shielding chart) through the mobile mast range as well as from all modern domestic and commercial wireless technologies such as Wi-Fi and smart appliances. As a bonus, it offers great solar reduction and cooling in the summer and heat retention in the winter. As you can see from the images, it creates a mirror effect on the outside, providing excellent privacy and extra security for you and your possessions, but visibility from the inside out is not compromised.