<p>Product Description Battery: 4 AAA batteries (not included) Effective distance: 5m Material: ABS Product size: 4.2 x 3.3 x 9.5 cm Colour: army green Package content: 1 * Ultrasonic Dog Repeller 1. 【EFFECTIVE TRAINING DEVICE】- The ultrasonic bark control device can not only prevent 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 barking habit 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 the ultrasonic sound is 25 KHZ for a maximum and effective range of 5 meters. It produces high-pitched ultrasonic sound which is annoying for dogs and at the same time it is quiet for human (audibility is limited to 20KHZ). It is completely harmless and safe for humans and dogs. 3. 【CONVENIENT TO CARRY】- It's small and lightweight and fits perfectly 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 high performance and waterproof ABS material. The LED light on the top of the button can indicate working status and low power mode. 4. 【SUITABLE FOR ALL SIZES OF DOGS】- The ultrasonic dog barking deterrent has 2 different levels. A simple button to operate, suitable for small, medium and large dogs (from 6 months to 8 years old).With a frequency button, you can adjust the ultrasonic frequency according to the dogs condition. We recommend starting with the unit at low voltage and then increasing the wattage as needed. 5. 【FRIENDLY NOTE】- Anti-bark device may not be effective on hearing impaired and older dogs. We recommend using this ultrasonic bark control on dogs over 4.5 lbs. Do not use on aggressive dog.</p>Note: The data is all manual measurement, please allow 1-3cm error; due to the light and display difference, there would be a certain color difference, please refer to the actual object received.