The PSG 202 is a great high quality entrance into electrical stimulation. This power box has dual outputs (so you can use more than one e-stim product). This box has dual controls, so you can moderate the electrical levels for each of the dual outputs individually. So you can use two different devices connected to two different areas and be sure that each is getting the optimum level of stimulation. On the front of the box are three sets of controls. The two knobs at the top are individual intensity controls, which lets you apply different pressures between the A and B outputs. The pulse rate control let" s you adjust the pulse cycle times. You can have anywhere from a slow pulse rate to a quick pulse rate. The frequency control let" s you adjust the frequency of the output signal. There are also quick disconnect buttons so you can immediate stop an electrical flow for one or both of the A and B outputs. Compatibility: The box runs on either AC power (included) or one small 9 volt battery (not included). Rimba accessories will work with Folsom units if you use the Folsom and Erostek In-Line adapter. You get a lifetime manufacturer" s warranty.