Insulated inductive probe tip prevents shorting conductors Tests include wire trace, continuity test, clear/busy/ringing line test and tip/ring identification Alligator clips for non-terminated cables and modular connectors for direct connections to telephone and internet wiring Selectable continuous or variable tone generation Built-in speaker on probe with sensitivity control Specifications Weight 272g (0.6lb) Power 9V battery (tone generator and probe (1 each) Tone output 1kHz, 6V square wave (approximately) Generator 63.5 x 63.5 x 38.1mm (2.5 x 2.5 x 1.5in) Probe 228 x 57 x 25.4mm (9 x 2.25 x 1in) Items Included Amplifier probe Tone Generator with alligator clips modular RJ11 phone RJ45 digital connector cables 9V batteries case