The Triplett 965 Breaker Sniff-It™ is a microprocessor-based circuit breaker locator designed 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 and audible indication. Fully automatic with no adjustment necessary. 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 (not included) for long life and reliability. Limited Lifetime Warranty.