Specification: Item Type: Cable Tester Material: Plastic Weight: Approx. 264g / 9.3oz Receiver Battery: 6F22 9V (battery Not Included) Transmitter Battery: 6F22 9V (battery Not Included) Purpose: Cable Tracing Package List:1 x Receiver (battery Not Included) 1 x Transmitter(battery Not Included)1 x User Manual1 x Storage Bag The main function of cable tester is to identify and track groups of wires or cables easily and conveniently Thiscable finder is a good auxiliary tool, which can help to install, debug and maintain telephone lines The cable testing tool can also be used to judge the line status, with strong practicability The receiver battery of the line finder needs 6f22 9v (battery not included), and the transmitter battery needs 6f22 9v (battery not included) The cable detector with high quality durable plastic, strong, not easy to damage, long service life, can be used for a long time.