Features: The upgraded technology suppresses excessive and noise barking by sending out ultrasonic and quiets the dog. It is more effective in blocking and waterproofing than the old version. Safe-trust by dog trainers and veterinarians. There is no electric shock, no liquid propellant is used, most human and widely used method to prevent your own dog or neighbor's dog from barking. Small size design, be easy to hanging/install on trees, wall or fence posts to prevent dogs from barking. Running on 9V battery (not included ), it can be used for up to 2 months depending on the usage. Suitable for dogs of all size-use high-frequency sounds to reduce excessive barking within the hearing ranges; suitable for dogs 6 months and older, the ranges doesnot exceed 25feet. Specifications: Material:ABS Power:9V Battery(not included) Size:Approx.100mm/3.94''x43mm/1.7''x61mm/2.4'' Package Includes: 1Set Dog Barking Deterrents Device note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.