I have to tell you, the performance of Lentek's Super Bark Free really surprised me. In a GOOD way!
Our neighborhood has a bunch of constantly-barking dogs. This drives me crazy as I work from home. I've called the police, who were useless and referred us to the Humane Society. Who was also useless. They said they'd send a letter or something. Regardless, nothing changed.
The most annoying dog BY FAR is our neighbor's behind our back yard directly facing our bedroom. There is a chain link fence and their house's wooden single wall between us and the dog 25' away. It's one of those annoying yappy dogs like a miniature pinscher or chihuahua mix. You know, that kind of shrill shrieky high-pitched yap that makes your skin crawl. This dog grated on our nerves all day and night long!
Out of desperation, I gambled on this device and I made sure I bought it from Amazon so that I'd be able to return it hassle-free when it proved useless. NNNOOO!!! Within an hour, that damn dog was silent. From then on, only SHORT bark episodes would escape that frigging dog before it shut up again. This dog would literally bark ALL day and ALL night (YES, at 2am, 3am, 4am, 5am, etc.)! We have had MANY sleepless nights because of this damn dog! Now it's more or less quiet!
My girlfriend works for an eccentric rich woman with SEVEN spoiled-rotten totally undisciplined papillons at her home. Yes, another small shrieky yappy breed. These dogs are neurotic and bark, ALL OF THEM, at EVERYTHING! She was ready to quit but decided to take the device to work. MUCH to her surprise, the dogs shut up immediately! They all stare at the device confused and whimper a bit but they shut up after one or two barks initially, then they think twice before barking. Now, the device is specifically labeled "for outdoor use only," but whatever. Those stupid yappers are quiet now.
This thing turned out to be a great investment! We got it almost 2 months ago and put rechargeable batteries in it and have recharged them once just to make sure it would not die on us. It appears that a single charge should last at least 2 months. It is well worth the price if you are simply going crazy from barking dogs.
My gripes about this product are that the other dogs nearby aren't affected by the unit. They are about 100' away. I WISH this unit had a longer range/higher sensitivity. Another thing it could use is a visual alert indicating when it's been activated and not just powered on. Preferably a rotatable visual indicator so the user can tell when the unit is sending its inaudible signal. Also, its audible mode is REALLY annoying. This may be designed to intensely upset the offending dog's owner into quieting that damn dog down. But the user will have to hear it also and it's worse than the dog barking. A simple single beep option to indicate that the unit has been tripped would be VERY nice.