[High Quality] This Tone and Probe Kit is made of high quality materials, wear-resistant and corrosion-resistant. The normal gain is 30 dB and the input impedance is nominally 100 M Ohm. Please note that the wire tracer requires two 9V batteries (not included). [Powerful Function] When used with any sound source, the professional wire probe and toner kit with adjustable volume can identify and track wires or cables in a group without damaging the insulation. The clamp mode can be used for direct measurement of non-terminal cables, as well as telephone and network line measurements. [Easy to Use] The method is simple and the test results are accurate. Insulation probes and built-in speakers can effectively avoid short circuits of conductors. The measurement scope includes line tracking, short circuit testing, clear/busy/ringing identification, and safer to use. [Safety and High Accuracy] The circuit tester has a spring-loaded ON/OFF button; adjustable volume sensitivity control; recessed terminal port for mobile phone connection; carbon fiber resistive plastic tip to prevent accidental short circuit when detecting wires. Optional continuous or adjustable generator, simple method and accurate test results. [Scope] The 200EP sound source and probe kit with probe are widely used in cable and wire maintenance. The measurement area includes line tracking, short circuit testing, clear/busy/ringing recognition. For non-terminal cables, the alligator clip mode can be used for direct measurement, telephone line and network cable measurement. Equipped with built-in speakers Specification: Material: Plastic. Gain: 30 dB nominal Input impedance: 100 m ohms nominal. Probe tip resistance (Min): Metal tip: 0 Ohm, Plastic tip: 300 Ohm Battery: 2 x 9V batteries (NEDA 1604, JIS 006P or IEC 6LR61) (not included) Battery life (nominal): 50 hours. Temperature: Celsius: 0-50, Fahrenheit: 32-122 Package Contents: box : 1 x Cable Tester (2pcs) (Battery not included) 1 x Replacement Head 1 x Storage Bag 1 x English User Manual Weight: Approx. 300 grams Dimensions (L x W x H): Approx. 231 x 55 x 28 mm. This sound and probe kit is made of high quality materials that are resistant to abrasion and corrosion. The normal gain is 30 dB and the input impedance is nominally 100 M ohms. Note that the wired speaker requires two 9V batteries