I have to admit, it solved my problem with 2 dogs that barked a lot. Today they gave their first bark and there was complete silence! It's been 3 weeks, I haven't needed to charge it yet, it works normally... The only thing is that it has a light that flashes continuously and it's quite strong, I had to cover it. That's it, I regret not buying it sooner, I'm buying more for my family.