CY Ultrasonic Outdoor Bark Controller No Barking Household Training Tool Device in Birdhouse Shape,Anti Barking House for Animals (Black) by CY Pet Uses ultrasonic sound to deter nuisance barking Two color LED for good and low battery indication Internal microphone used to detect barks up to 50 feet Sensitive microphone isolates and picks up barking up to 50 feet away to stop barking both outdoors Package included: 1x CY Ultrasonic Outdoor Bark Controller 1x User Manual(English)