The Fox & Hound™ 3399 wire tracing kit consists of a versatile Fox 2™ Tone Generator (Toner) and a high performance Hound 3™ Inductive Amplifier (Probe). The Fox 2™ is a battery operated handheld multi-function Toner that generates multiple tones (Pulse or Warble), performs some basic telephone line tests (loop mA, line polarity, and ringing voltage), provides a visual and audible continuity test, and integrates our own True Trace and TripLatch tests while providing overload protection up to 120 VAC. The Hound 3™ is a battery operated handheld lightweight Probe, with a thumbwheel Sensitivity control and Signal Strength indicator LED. It improves on previous designs with built-in LED headlights to illuminate dark areas and reduce fluorescent light noise, a bandpass filter to suppress unwanted frequencies, an earphone jack for noisy or quiet work areas, and an easy access battery cover.