PAC TL-PTG2 Tone Generator and Speaker Polarity Tester with RCA Cable Tester Tone Generator and Speaker Polarity Tester Perfect for safely troubleshooting and testing audio systems Output range of 0-8 volts at a variable 13 to 10,000Hz tone 9V Speaker popper for visually testing speaker connection polarity Includes RCA and alligator clips for connection Safely troubleshooting and testing audio systems Output range of 0-8-volts at a variable 13 to 10,000Hz tone Tone for setting system levels, checking speaker x-over points, verifying connections 9-volt speaker popper for visually testing speaker connection polarity Connections can be made via supplied RCA or alligator clips