^^^^ There are a few different types of rectal/prostate probes. You can use any probe on any power supply as long as you have an electrical connector/adapter.
One type of probe shaped like a butt plug has the two electrodes arranged lengthwise from the anal ring to almost the tip of the probe. Depending on how you insert the probe and rotate it, the electrodes can go from the right to left or if you rotate it 90 degrees, the electric current goes from front to back. Just see how you like it best. Another type of rectal probe is uni-polar and requires another probe to be worn, usually as a ring around the head of the penis or as a ring with about a one inch urethral insertion at the head of the penis. You could also use an adhesive pad on the underside of the head of the penis. That sends my husband screaming with ecstasy. Another good option is to use an adhesive pad on the underside of the head of the penis with another ring at the base of the penis or around the balls or as a rectal probe to complete the circuit.
Another electrical arrangement is on one of my cylindrical vaginal probes, which has an electrode at the tip of the probe and another at the base of the probe so the current goes essentially from the labial area to the deep section of the vagina, creating a muscular action of tensing and contracting the vagina lengthwise from inside-out. I like to use a light weight rope to tie this electrode on, kind of like wearing a low slung hip belt as I lay back in bed and just have it done to me. I like this a lot, others don't. My husband has used this rectally, he also likes it, but he hasn't had an orgasm from this particular probe. To each his or her own.
The best probes for a man to have an orgasm are the bi-polar urethral probes which are inserted 6-8 inches into the erect penis (BE VERY CAREFUL WITH THIS ONE-YOU COULD PUNCTURE YOUR URETHRA IF NOT CAREFUL) where one electrode enters the urethra inside the prostate gland and the other part of the probe has the active electrode inside the urethra at the head of the penis. THAT one is best for men achieving a hands-free orgasm.
See these for information and equipment:
I'm such a dirty girl! ;D ;D ;D ;D