When should we use this before or after  study or in studying mean while.....is this a correct right Hz which u have uploaded is this original....does contain any side effect .....if we listen daily or once in a day will it harmful us ....how to use pls say? Tq
Use it while studying. The biggest danger is hearing damage, so be sure to keep the volume nice and low. My 2-minute warning near the end should NOT be loud and scary!
Nikhil Shetty