About Klein Tools TONER-PRO TONE GENERATOR A-VDV500-063

Professional grade analogue tone generator for open-ended, non-active wiring
For use with Probe-Pro Tracing Probe (VDV500-123) required (sold separately)
Five distinct tone cadences
Rugged Angled Bed of Nails (ABN) clips securely to attach to wires
An RJ11 plug easily connects to telephone or RJ45 data jacks to tone individual conductors or wire pairs.
Tests for continuity and polarity, which are indicated by clearly labelled, easy-to-read LEDs
Auto Power-Off and Low Battery Indicator
Loop for a lanyard
(4) AAA Batteries included