It intends and designed for car maintenance/ repair technicians to locate the abnormal noise emitting from elements of the vehicle at a far higher efficiency, much more efficient than ever. High technologies certainly benefit automotive techs and are applied in engine, power wires, and lines. With two earphones for the engineer and customer to operate together to share diagnosis results with customers. Contents: User menu, 2 pcs of earphone, 5 pcs of test clamp, 1 piece of test sensor (with magnet), 6 pcs nylon fastening tapes, 1 unit of control box, 1 outer case and 1 magnetic testing probe. Please also check our ebay store:http://stores.ebay.com/topautotoolsClick here to visit our ebay store! We Accept PayPal .