Aneros Vice 2

It doesn't do much for the person wearing it. There are rings (Lovense Diamo, We-Vibe Verge, for example) designed to position the motor behind the testicles on the wearer, which is much more sensitive. They're also typically not as tight so they won't restrict bloodflow and delay orgasm as much. Also, consider a prostate plug or vibrator (Aneros Helix Syn Trident, We-Vibe Vector, Lovense Edge 2, LELO Hugo, Aneros Vice 2) to put a good pressure on prostate during intercourse.

The remote also has a nice button on top of it you just squeeze the top of the remote and it turns the vibrations up to maximimum power. The Aneros Vice 2 is the most expensive aneros prostate toy but in my opinion it's worth it.

If you're looking for prostate specific toys I would highly recommend the Aneros Vice 2, I have this one personally and it was the first toy to ever give me a prostate orgasm, it's very effective. It has several different vibration patterns and intensity settings plus it has a wireless remote. Another option to consider if you're interested in slightly larger anal toys I would highly recommend the Egg Plug from SquarePegToys. They're a bit expensive but totally worth the price.