LBRNO Cable Wire Phone Line Telephone Notwork Toner Generator Tester Tracker With Bag Streamlined design and easy to carry.Comes with earphones usable in noisy situation Appearance dimension: 175*42*27mm(receiver); 126*49*34 (emitter) Line-tracking function ( fast and reliable ) Low Battery Indication with Bright white LED flash light. Rapidly find the target wire from among plenty of telephone wires. Rapidly find the target wire from among plenty of network wires Trace telephone wire/LAN cable. Trace wire in electrical system. It can take place of cable tester.