The CT20 allows a single user to quickly identify and label two wires even when the wire ends are located in different rooms. The CT-20 can also be used as a standard continuity tester. This tester is shipped fully tested and with proper use will provide years of reliable service. Routing can be easily tested Dimensions: (L x W x H) 90 x 57 x 27mm Max. cable length: 3000m Power supply: 9V battery pack (Not supplied) Suitable for: Identification, continuity, interruption measurement Weight: 260g Supplied remote unit, belt holster and user manual .