For sale is this brand new in the box ultrasonic dog training tool. I have one of these myself and didn't need a second one although this one is nice and compact and I wish I had had this one first. These are great when your dog is barking and won't stop. I simply push the one button and it emits an ultrasonic sound that instantly gets their attention and stops the bad behavior. We can't hear it at all but man does it work for them and I have mine set on the lowest setting. This one has 6 training modes and it has a 23Ft. range. It is rechargeable and also has a flashlight capability. Comes from my smoke free home. From their website: Stronger Bark Control with 3X Ultrasonic Emitters: Unlike single-emitter devices, our upgraded dog bark deterrent features three synchronized ultrasonic heads—delivering 3X the coverage to quickly stop barking, biting, and jumping behaviors. Ideal for anti barking training, safer than bark collar, more effective than a dog whistle, offers a humane, high-performance dog training solution. 6-in-1 Safe & Humane Training Modes:Our dog bark deterrent device features dual ultrasonic frequencies (fixed 25kHz and variable 20-30kHz), combining 4 ultrasonic modes plus an audible beep and LED flashlight for versatile training. Whether for daily training or stubborn, persistent barking, this anti bark device adapts to different dogs providing effective bark control without causing pain or distress. Fast Charge & Long Battery Life