Features: The 2 in 1 ultrasonic dog trainer is a professional equipment used for dog training and bark control. The emitted ultrasonic can attract the attention of dogs and help prevent unwanted behaviors such as barking, digging, scratching, biting, and climbing furniture. The device can emit a fixed frequency of 25KHZ, which human cannot receive, but it is suitable for dogs. No vibration, no noise, no contact with dog skin, and no impacts on dog hearing, so it is harmless to dogs. Suitable for small, medium, and large dogs. The device can not only train your dog, but also prevent other dogs from approaching you while walking, jogging, or cycling. Just press button and point the device at the dog when it bark or approaches you, and the dog will stop their bad behavior. The control ranges is 16.4feet. Equipped with a wristband, it is convenient for you to carry around and easy to use both outdoors and indoors. This device use USB charging. 2hour fast charging, working for about 30 days, no need to worry about running out of battery. Specifications: Material:ABS Battery Capacity:600mAh Interfaces:USB Effective Ranges:16.4Ft Waterproof:IPX2 Shape:Standard,Bone Package Includes: 1Set Dog Bark 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.