ET64220 Features: -Wire tracer.-Must have for audio and video installers and data com technicians.-Identifies wires such as coax, CAT 5, speaker, phone, or any non energized wires.-Adjustable sensitivity positively identifies a single wire when multiple wires are routed in close proximity.-Audible and visual indication.-Transmitter operates from two AAA batteries and receiver operates from four LR44 batteries. Includes: -Includes RJ 45, RJ 11, coax, automotive fuse blade and insulated clamp adapter plugs.-Auto off function included with transmitter to save battery life. Dimensions: -Dimensions: 1.5" H x 7" W x 8.38" D.