Suggested Retail:$30. Humutan Anti Barking Device, Ultrasonic Barking Control Device, Waterproof Outdoor Anti Bark Deterrents in Birdhouse Shape. The ultrasonic frequency is not harmful to pets and completely inaudible to human ears yet safe and effective training tool for your dog or the neighbors dog to disrupt the barking. Effective on most dogs within range.. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. PAID DELIVERY AND 7 DAY ALTERNATE PICK-UP ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.