Energiser MS3000 neuromuscular stimulator, fixed 250 microsecond pulse width, adjustable in frequency from 2 to 120 Hz, with the additional option to ramp it up and down on top of that with a period adjustable from 1 to 8 seconds, or sinusoidally cycle with a period between 1 and 30 seconds. Each unit has two outputs to control two independent connections through 4 electrodes. Virtually identical to another model of TENS unit (click here), which we also have.
Dual channel (2 independent outputs)
Uses one 9-volt battery (included)
Pulse width 250 microseconds fixed
Pulse rate: 2 to 120 per second, adjustable
Output type: constant current during pulse
Current output: 0 to 80 mA, adjustable
Battery life: 70 hours
Weight: 5 ounces with battery
Extra features: 1 to 30 second cycle wave in intensity, adjustable.
1 to 8 second cycle linear on-ramp, adjustable.
Additional notes: The electrode conductivity gel in the picture is currently not available with the unit because most of ours got frozen and the bottles leaked out or broke. But just use a few drops of salt water and some alcohol. 12 single-use electrodes are included, but the same electrodes' usefulness can really be dragged out to several uses. Stop using them when you can no longer get them to stick.