Multi-Purpose, Wire Tracker & Tracer, For Identifying Wires Such As Coax, Cat 5, Speaker, Phone, Or An Non-Energized, Non-Live Wires, Adapter Plugs Include Rj-45, Rj-11, Coax, Automotive Fuse Blade, & Insulated Clamps, Adjustable Sensitivity Positively Identifies A Single Wire When Multiple Wires Are Routed In Close Proximity. Audible & Visual Indication, Uses 2 "AAA" Batteries For Transmitter & 4 Lr44 Batteries Receiver, Included.