02-03-2014, 02:27 PM
From another thread:
if you use it not more than 25% maximum volume should be safe..
I use ultrasonic with earphones most of the day ... and I hope is safe. And I hope is effective as the masked sound with earphones.
if you use it not more than 25% maximum volume should be safe..
I use ultrasonic with earphones most of the day ... and I hope is safe. And I hope is effective as the masked sound with earphones.
