Schumman Earth Frequency - Does It Really Works for LD?

sorry newbie here, but i wonder if 7-10Hz excitation may help in Lucid Dream? anybody have bought such device to help them?

Earth Breathing
Schumann resonances - Wikipedia, the free encyclopedia

http://files.sharenator.com/interdas...567-247518.jpg
Now you've got me reading in to even more cool stuff.