12-23-2015, 07:20 PM
(This post was last modified: 12-23-2015, 07:20 PM by dissonance.)
you can also try out iphone cases with speakers built in, and just have the ultrasonic playing on it at a louder volume, and carry your iphone around while you work (if that's allowed), it'll be discreet. There's a new one that's supposedly really good quality and it's called the peri-duo. But this method won't work if you don't have an iphone..