Zircon Breaker ID - DIY Circuit Breaker Finder / Compatible with Outlets up to 120 Volts / Circuit Breaker Identifier FFP Using the Breaker ID circuit breaker finder is a simple, 1-person operation Patented technology of this circuit finder eliminates false positives making it quick and efficient to scan, identify, and label all breakers with no accidental shutoffs Zircon's circuit identifier calibrates automatically, plugs into outlets up to 120 V, and uses lights and audio to indicate when the circuit is found Transmitter and Receiver of the Breaker ID snap together for easy and secure storage One fully charged 9V battery, not included, is required for the circuit breaker finder to run at optimal performance