Product descriptionBattery: 4 AAA batteries (not included)Effective distance: 5mMaterial: ABSProduct size: 4.2 x 3.3 x 9.5 cmColor: army greenPackage content: 1 * Ultrasonic Dog Repeller1. EFFECTIVE TRAINING DEVICE- Ultrasonic bark control device can not only stop dogs from barking, but also tell them their uncivilized behavior. You can correct unwanted behaviors such as jumping, digging, chasing, scavenging, and excessive barking. It can change your pet's bad habit of barking under the principle of ultrasonic sound.2. EASY TO USE - Just press a button to emit an ultrasonic sound that can only be heard by the dog. The frequency of ultrasonic sound is 25 KHZ for a maximum effective range of 5 meters. It produces a high-pitched ultrasonic sound which is annoying for dogs and at the same time it is silent 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 lightweight and fits perfectly in your pocket, designed to be convenient to carry with you. Suitable for indoor use and walking the dog outdoors as well. Made of high performance and waterproof ABS material. The LED indicator on the top of the button can indicate the working status and low power mode.4. SUITABLE FOR ALL SIZES OF DOGS - The ultrasonic dog bark deterrent has 2 different levels. Simple button to operate, suitable for small, medium and large dogs (6 months to 8 years old). With a frequency button, you can adjust the ultrasound frequency according to the dogs' condition. We recommend starting with the unit on low voltage and then increasing the power if necessary.5. FRIENDLY NOTE - The anti-bark device may not be effective on hearing impaired and elderly dogs. We recommend using this ultrasonic bark control on dogs weighing more than 4.5 lbs. Do not use on aggressive dogs.