Review on Ultrasonic Dog Barking Control Device - Sonic Deterrent for Bark Control - Mini 🐶 Repellent with 50 FT Range - Silencing Ultrasound - No Bark Training Device for Dog Security by Catherine Foht

Only works for a few weeks. I had to buy some 9 volt batteries to get started with this. I have dogs in my neighborhood, German shepherds, and they bark all the time. The owner has tried several bark collars but they never worked. I placed this bird house in the corner at the fence line. The older female immediately stopped barking. The younger pup just ignores it and barks anyway. However, when they bark, they look at the box and are afraid of it. They're not barking in that corner anymore, so it's working. I set it to medium range so I don't burn batteries. I love it.