The Klein VDV500-051 TONEcube Tone Generator is crafted for optimum durability, reliability and functionality, and is engineered with you in mind. Designed for, and by, electricians, the electrical tester provides the latest in innovative, time-saving features that professionals require. The tool traces wire paths and identifies cables in common wiring systems. The tone generator features five discrete tracing tones including high-warble, low-warble, mono, ascending, and descending. Design features like heavy-duty leads, tugged RJ11 and RJ45 modular plug, continuity testing, voltage overload protection, line status and polarity, power-on flashing LED indicator, auto power-off, low battery indicator, and lanyard attachment loop, put the VDV500-051 in a class by itself in safety and versatility. Heavy duty leads with rugged dual-mode modular plug allows for direct connexion to both RJ11 and RJ45 jacks. Momentary slide switches prevent accidental operations. The VDV500-051 uses a 9V battery with an active life of 120 hours and 4 years on standby. Designed for use with Klein VDV test tools VDV526-054 and VDV500-60. Also works with many other manufacturers' analogue tone probes. Since 1857, Klein Tools has manufactured the world's finest hand tools. Today, Klein Tools is the No. 1 choice among professional tradesmen. Klein Tools' dedication to quality and innovation continues with products available for professional tradesmen worldwide.