OF v3

[Shannon]

Are you sure that's the best volume?

On earbuds
Is that a bad idea?
I want to try it first before going on to masked if I have to.
I dont think one hour of US on earbuds will significantly affect hearing would it?

Ah, on earbuds that's what you would need - especially if you're using ultrasonic.  The ultrasonic itself doesn't cause issues, but the volume can if it's too high or too low.  It's easy to make either of those mistakes, which is why we recommend against ultrasonic on earbuds.  One hour doesn't matter if you do it enough, because it can still cause problems if its too loud. That volume should be okay.