Review on Zigzagmars Adjustable Ultrasonic Rechargeable Waterproof by Amber Ramos

First, PSA: If you have tinnitus, this device can make it worse, especially at levels one and four. Every time I'm near him my ears are ringing and he emits a 15k tone. Other tones affect me a little, but not that much. Disappears after a few days. However, I got two, both set at sensitivity level 4, one at frequency level 2, the other at level 3, they set 15 feet apart on our fence at eye level with my dog to my yard. , and immediately the barking over the fence stopped. When she gets used to the noise and starts being kujo and barking wildly at all the dogs on the other side of the fence, I change the frequency and move the devices and the barking stops. I brought one in and the couriers stopped barking. Move them around, change the frequency, get two, two gives you more variety and in my experience they keep doing their job.