With its patent pending technology, the DefenderPad® blocks the full frequency spectrum of harmful electromagnetic radiation from 0-10 GHz which includes Extremely Low Frequency (ELF) and Radio Frequency (RF) emissions while decreasing heat radiation down to near undetectable levels. The DefenderPad® is the only independently tested laptop radiation shield that can make this claim. When using a laptop on you lap, just place the DefenderPad® between your laptop and your lap.