Dog Silencer - Ultrasonic Outdoor Dog Anti Barking Device portable ice maker The rotating variation in frequency

The rotating variation in frequency and pressure means bats can't recalibrate - the sonar feedback they rely on becomes unreliable and stressful

9" Red Cover PopUp Card - blank inside - You can add your own words

Each unit covers 16-26 ft in every direction - stack them to keep dogs away from your full yard

or 24-hour mode keeping protection on your schedule

Dog Silencer - Ultrasonic Outdoor Dog Anti Barking Device portable ice maker The rotating variation in frequencyKeep your dog quiet and well behaved with the DBzon Ultrasonic Outdoor Dog Anti Barking Device This small but powerful device emits ultrasonic waves that deter your dog from barking, without causing any pain or harm. It's made of durable ABS material and is completely waterproof, making it perfect for outdoor use. This high performing solution emits a harmless, high pitched ultrasonic sound which can be heard by dogs as far as 50 feet away, but is