Features Spring-loaded ON/OFF button; adjustable- volume sensitivity control; receed terminal- ports- for handset- connection; resistive plastic carbon-fiber tip prevents accidental- shorts when probing wires-. Widely used in the maintenance of cables- and wires-. The measurement area includes line tracking-, short- circuit test, clear/busy/ringing identification. For profeionals- needing wire- tracker- tools without costly extras, this 200EP inductive amplifier- set is the answer-. Made of high-quality materials, wear-resistant, corrosion-resistant. One battery can last 50 hours-, very durable-. For non-terminal- cables-, the clamp- mode can be used for direct measurement, as well as for telephone and network- line measurement. Specifications: Material: palstic Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1 Set Tone Generator-