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Features: -Uses ultrasonic sound to deter unwanted barking Detects barks up to 50 feet with the use of an internal microphone -4 levels of operation including a test mode -Two color LED for good /low battery indication 9V Battery operation - (battery not included) - Durable and weatherproof - Sound Activated Speaker: Produces the ultrasonic sound Specification: -Microphone: used to detect barking -Sound activated speaker: produces the ultrasonic sound Switch with 4 levels of operation: -OFF-used to conserve battery life Test-used to verify the microphone and speaker are functional - 1=Low Range-up to 15 feet - 2=Medium Range-up to 30 feet - 3=High Range-up to 50 feet