Anti Barking Control Device, Ultrasonic Dog Bark Deterrent, Mini Sonic Anti-Bark Repellent 50 FT Range, Stop Barking Bark Stop R [UPGRADED VERSION]Ultrasonic anti-barking devices automatically detect barking from as far away as 50 feet. The barking control device automatically emits high-pitched sounds that only dogs can hear. Once the dog stops barking, the ultrasonic bark control automatically stops emitting ultrasonic sounds [SAFE FOR DOGS AND PEOPLE]Ultrasonic frequencies are harmless to pets and completely inaudible to the human ear, so you can use this device safely [HOW TO WORK]Can be hung on a tree, indoor, outdoor wall or fence post to stop any dogs barking(within range). When the luxury outdoor ultrasonic barking alarm clock detects excessive barking, the microphone will respond to barking and activation parts [Design]It needs 9 V batteries - (batteries are not included). The outdoor ultrasonic barking device has a power indicator. When you leave, it can be set to "Off" to protect the battery.Designed for outdoor use, outdoor ultrasonic barking device size:11*6.5*5.5cm Material:plastic colour:black Package Contents: 1 * stop barking dog devices Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.