The Triplett Breaker Sniff-It™ is a circuit breaker locator with a microprocessor for high accuracy results. This simple to use product comes with a remote and main unit that work together to help locate breaker locations with visual & audible indication. The Breaker Sniff-it™ remote does not require a battery and is powered by the outlet, the main unit is powered by a 9 volt battery for long life and reliability.