What is special about WWVVPET Variable Frequency Ultrasonic Anti-Bark Device? Our WWVVPET anti-bark device uses the latest ultrasonic technology and Variable Frequency technology - when the dog is no longer sensitive to the standard frequency ("Ⅰ"), switch to Variable Frequency ("Ⅱ") and the dog will respond to it again. The ultrasonic sound is not audible to humans, but can easily grab the dogs' attention and train them. Because of the unique Variable frequency technology, WWVVPET dog training device can emit the ultrasonic sound of different frequencies, which can attract the dog's attention very well, avoid getting used to listening to the ultrasonic sound of constant frequency and no longer respond to it. The sound emitted is intended to be loud and distract the dog's current state of mind, which is safe to be used to stop the dog's bad behaviors and to get rid of unwanted barking. How to Use? When dog barks or makes mischief, simply press and hold for 10s towards him (Max control range: 16.4ft), or switch to Variable Frequency ("Ⅱ") when the dog doesn't respond to it. （Tips: Consistent training and appropriate rewards are required to achieve the desired result.） Important Notes: 1. The product may not be effective on dogs with hearing problems. 2. We do not recommend it for use on dogs under 6 months or over 8 years and also the aggressive dogs. 3. Only training one dog with this device will be better. 4. In order to achieve long-lasting results, please be patient and consistently use the product as a training aid, along with commands and positive reinforcement. 5. Please note, it cannot be used to disperse the pie-dogs. Package Includes: (Needs 4 AAA batteries but Not include) Ultrasonic Dog Training Device *1pc User Manual *1pc Wrist Rope*1pc
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