ent.
1. Provides an adjustable volume control
2. Compatible with all common tracing tone sources
3. Easy cable connection with either RJ-45 jack, patch cord, or alligator clips
4. Receiver & Sender
5.Testing polarity of phone lines
6.Tracing a wire
7.Finding wires buried behind drywall
8.Test whether a cable is interrupted
9.Find interrupts in cable10.Power:9V battery (6F22)