Just purchased an Airwick Freshomatic and haven't opened it yet...but it runs on batteries and my understanding is that it puffs out a bit of freshening scent at intervals. I want to put it near the litterbox (in the laundry room), but concerned that if they hear the "puff" while in the litterbox, they might freak out and be scared to use the litterbox in the future. I would put it up on a counter, not at litter box level, but didn't know if the sound alone would upset them. Any opinions?