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  Color:black  Dimension: long wide high: 15.5cmx15.5cmx16.5cm   Installation and Setup  The outdoor bark control should be placed facing the dog and with the range of a dog.