Chattanooga Group Intelect TENS Manuel D'instructions page 13

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9. High or Low Frequency Tens. Set the mode selector switch to
the "N" position.
10. Adjust Pulse Frequency. Turn the Pulse Frequency control to
the setting recommended by your medical professional.
Timer (min)
9
30 60
10
Frequency (Hz)
10
C
150
2
C
60
115
9