The Amplifier Probe is designed to identify and trace wires or cables within a group without damaging the insulation. Work with any Tone Generator to identify wires, volume control for increased sensitivity and adjustable to suit work environment. Tone Generator is great tool for locating and Identifying cable pairs or individual conductors. This is also function as a continuity and polarity tester. Test results displayed on the three-colored led. Specifications Alternating Tone : V Connection : RJ11 connector, RJ45 connector (optional) Operating Temperature & Humidity : 0°C ~ 40°C, 80% Max Over Voltage Protection : 100V DC Power Source : Probe 9V battery, Tone Generator 9V battery Probe Dimensions : 270(L) x 50(W) x 25(H)mm Probe Operating Frequency : 1Hz~12kHz Receiver Distance :