Material: ABS Product size: 4.2 X 3.3 X 9.5 cm Color: green,black,grey 1. EFFECTIVE TRAINING DEVICE - Ultrasonic bark control device can not only prevent dogs from barking, but also show them uncivilized behavior. You can correct unwanted behavior such as jumping, digging, chasing, looting garbage and barking excessively. It can change your pet's bad barking habit under the principle of ultrasonic sound. 2. EASY TO USE - Just press a button to make ultrasonic sound that can only be heard by the dog. The frequency of the ultrasonic sound is 25 KHZ for a maximum and effective range of 5 meters. It produces ultrasonic sound high pitch which is annoying for dogs and at the same time it is quiet for humans (audibility is limited to 20KHZ). It is completely harmless and safe for humans and dogs. 3. CONVENIENT TO CARRY - It is small and light and fits neatly in your pocket, designed to be convenient to carry with you. Suitable for indoor use and for walking the dog outdoors as well. Made of material High performance and waterproof ABS. The LED indicator on the top of the button can indicate working status and low power mode. 4. SUITABLE FOR ALL SIZES OF DOGS - Ultrasonic Dog Bark Deterrent has 2 different levels. A simple button to use, suitable for small, medium and large dogs (6 months to 8 years) .With a frequency button, you can adjust the ultrasound frequency according to the condition of the dogs. We recommend that you start with the unit at low voltage and then increase the wattage if necessary. 5. USER-FRIENDLY NOTE - The bark control device may not be effective on hearing impaired and senior dogs. We recommend using this ultrasonic bark control on dogs weighing over 4.5 lbs. Do not use on dogs aggressive.