Toner-PRO Tone GeneratorThis tone generator helps with wire identification, wire tracing and wire pair identification. The tone generator provides five distinct tones for exact pair identification and features angled bed of nails (ABN) clips to securely attach to wires. An plug easily connects to telephone or data jacks to tone wire pair. Check for continuity and polarity with results indicated by clearly labeled, easy to read LEDs. California residents see Prop 65 WARNINGS