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Marialove Bark Control Device, Anti Barking Deterrent Ultrasonic Dog Bark Controller, Sonic Bark Deterrents Silencer Stop Barking Bark Stop Repeller How to Test 1. Set the knob to "1, 2 or 3" 2. Place the item at arm's length from you. 3. Whistle loudly into the product’ s microphone. If the LED is a stable red color and you can hear the beep, the item is working properly. Function & Advantages Stop excessive, noisy dog barking by emitting an ultrasonic sound to silence the dog. More effective than old version deterrents and waterproof. FOR DOGS OF ANY SIZE Uses high-frequency sound that works to reduce excessive bark of any size dogs within hearing range WELL-DESIGNED MINI SHAPE Can be hung on a tree, indoor, outdoor wall or fence post to stop any dogs barking(within range) Package Contents: 1 X ultrasonic bark controller (9V battery not included) 1 X user manual