The Test-Um KP309 Resi-Toner & Resi-Tracer Signal Tracing Kit offers unique and value features for finding, identifying and testing network/telephone/coax and security/alarm cables. This kit includes the TT300 Tone-Detector, the TG400 Tone-generator, and Test Cables. TT300 FEATURES: The TT300 combines unique new features for tracing telephone, network, coax, and audio cable with special functions for finding and phasing speakers and testing telephone systems. TG400 FEATURES: A full function tone generator with unique features designed to further test connections on telephone systems and speaker installations. Find your outlets and assure your connections with the Resi-TonerTM.