ABOUT DETAILS - The gain is norminal 30dB, the input impedance is nominal 100M Ohm, and please notice that wire tracer needs one 9V Battery(NOT INCLUDED)._x000D_ MEASURING RANGE - Measurement categories include line tracking, short circuit testing, clear/busy/ringing identification. Selectable continuous or variable tone generator_x000D_ CLAMP MODE - For non-terminal cables, clamp mode can be used for direct measurement, as well as for telephone and network line measurement._x000D_ HIGH ACCURACY - With optional continuous or adjustable generator, the is simple and the test results are accurate._x000D_ AVOID SHORT CIRCUIT - Built-in speaker tube on the probe, insulation probe and built-in loudspeaker can effectively avoid short circuit of conductor and to use. Colour:Gray-White_x000D_ Material:Plastic + Metal Package Contents:_x000D_ 1x wire tracer_x000D_ 1x connector_x000D_ 1x accessories_x000D_ 1x canvas bag_x000D_ 1x English manual Only the above package content, other products are not included._x000D_ Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_