Greenlee 500XP Cable Identification Probe for Twisted Pair Cables is designed as a handheld tone probe for tracing voice, data, and video cables. The Greenlee 500XP features simple two-button operation, real-time LED signal strength indicators, audible and visual alarms warn of hazardous AC voltage, hum reduction filter, bandpass filter, and compatibility with toners in the 500 Hz to 2.5 kHz range.