Sorry it a bit rusty it 20 years old. It stops microwaves I built a mock up of this 9 feet by 3 feet and I used to sleep in it becouse of night mares and it worked... with a few other things going on. Just like when you look into your microwave when you are cooking food you will see a pref panel on the window part of the door. That breakes up the microwave signal and makes it harmless. Safe for you... Same principle.. You can see by the metter low signal even with out the top.. im next to other signals being generated here...to test it.
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Sorry it a bit rusty it 20 years old. It stops microwaves I built a mock up of this 9 feet by 3 feet and I used to sleep in it becouse of night mares and it worked... with a few other things going on. Just like when you look into your microwave when you are cooking food you will see a pref panel on the window part of the door. That breakes up the microwave signal and makes it harmless. Safe for you... Same principle.. You can see by the metter low signal even with out the top.. im next to other signals being generated here...to test it.