Now you can use those Snap connection electrodes with a TENS unit or any other power unit, such as the SensaVox Em140, that has TENS pins at the ends of the lead wires to connect to your existing Snap Style electrodes.  Simple to use.  Just plug your TENS pin into the adaptor and Snap to your electrode.  A very quick and inexpensive connection solution.

Choose one or two.  Second one is $1.98.