TRENDnet s TC-TP1 is an easy-to-use amplified inductor and tone probe that is used for tone tracing and line testing. The TC-TP1 features a simple push button that provides easy operation and conserves battery power. This ergonomically designed device comes with adjustable volume control and signal LED for enhanced accuracy in noisy environments. The TC-TP1 also includes a Ring/Tip polarity test indicator. When combined with a compatible Tone Generator, a technician can quickly locate, isolate and test commonly used voice and data cables swiftly and efficiently.