Electromagnetic shielding - Wikipedia - Elecromagnetic sheild on bottom of keyboard
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"Heat and Radiation Attenuating Pad for Laptops" With Added RF Shield. Laptops emit a high WrapTop®. Magnetic Shielding for Your Laptop Keyboard Base. The Trusted World Leader in EMF Protection & Safety! Radiation is generated by a laptop in all directions: bottom, top and sides. harmful emissions are in the downward direction and the DefenderPad® is designed to shield that direction.