Circuit Breaker Finder, Alert Type Sound, CAT Safety Rating CAT III 750V, Display Screen Type LCD, Display Type Digital, For Circuit Type Energized, Non-Energized, For Voltage Range 0 to 750V AC/DC, Maximum Locating Depth 20 ft, Maximum Resistance Not Applicable, Operating Frequency 15.15 kHz, Receiver to Transmitter Distance 21,120 ft, Tracing Locations Floors, Non-Metallic Conduit, Walls, Standards IEC 61010-1 or IEC 60664, ISO 9001 (2000), NIST