If this is your thought right now, it's the most important objection to address — because it's the most common, and the most legitimate.
Here's exactly why your previous ultrasonic device didn't work, and why HushPup is a different experience.
Stationary units are passive. HushPup is active. A box plugged into the wall detects barking and emits a sound — automatically, from a fixed position, after the fact. Your dog isn't just reacting to a strange sound. She's reacting to a strange sound that always comes from the same corner of the room, at the same point in the barking cycle, with no connection to you or to her behaviour. It's easy to tune out. Especially once the novelty wears off.
HushPup is different because you are holding it. The interruption comes from you — the person your dog is already oriented toward, whose movements she already watches, whose presence already carries meaning. This matters more than it sounds. Dogs don't learn from sounds. They learn from associations. When the interruption comes from you, in the moment you choose to use it, the association being built is far more powerful than anything a passive device can create.
Automatic collars correct too late. HushPup corrects on your timing.
No automatic device — collar or stationary — can use the same judgment you can. You can see your dog's body language tightening before the first bark. You can feel the moment the trigger appears. You can act in the window before the habit fires. An automatic device can't. It always arrives after.
Range and environment aren't obstacles. You move with your dog.
Stationary ultrasonic units consistently fail on range — the box that claims 50 feet reliably falls short at 15. Outdoors, wind and distance reduce effectiveness further. HushPup goes where you go: on walks, at the park, in the backyard, when visitors arrive at the door. The situations that have always been hardest to manage are precisely the situations where HushPup is designed to be used.
If ultrasonic didn't work before, it wasn't the frequency that failed you. It was the timing, the positioning, and the passivity of how it was delivered.