Chattanooga Group Intelect TENS Manuel D'instructions page 12

7. Adjusting the Controls. Ensure that amplitude controls for both
Channels 1 and 2 are turned to the "OFF" position.
8. Connect Leads to TENS Unit. Insert 90° end of lead wire set
into the channel output receptacle to be used (1 and /or 2),
pushing plug all the way in.
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