Mini Bark Control Device Outdoor Anti-Barking Ultrasonic Dog Barking Control Sonic Bark Deterrent Stop Barking  The upgraded technology suppresses excessive and noisy barking by sending out ultrasound waves and quiets the dog. It is more effective in blocking and waterproofing than the old version. 100% safe-trusted by dog ??trainers and veterinarians. There is no electric shock, no liquid propellant is used, most humane and widely used methods to prevent your own dog or neighbor's dog from barking. Mini design, this bark control controller is equipped with a well-designed mini shape. Designed to be easy to hang/install on trees, walls or fence posts to prevent dogs from barking (within range) Running on 9-volt battery (not included in the scope of supply), it can be used for up to 2 months depending on the usage. Suitable for dogs of all sizes-use high-frequency sounds to reduce excessive barking within the hearing range; suitable for dogs 6 months and older, the range does not exceed 25 feet. size: 10.3x4.3x6.2CM Material:ABS colour:Black Package Contents: 1 x dog barking control 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.