The best vibrating cock rings I have used so far are..
Number 1) Boss Cock’s Vibrating Cock Ring

The boss
It isn’t expensive and it is buckloads of fun, if I had to choose a cock ring it would be the Boss Cock. At 10 bucks this is a real bargain.
3 Best Things about penis ring
1. The power- It really takes vibrations to another level, especially for the size of it. 2. Very quiet- This vibrating penis ring is much quieter than many of the other models online. You may thing sound is not such a big deal, but trust me, after awhile a noisey toy can get real annoying. 3. Comfortable and stays in place-Unlike some other rings which will remain nameless, this won’t chafe your cock or move out of position. Excellent for sex in many different positions.
Any problems?
1. Can’t be sterlized- This cock ring is made from non-porus material so you cannot sterlize it. That means no sex with multiply partners! Other than that it is all good.
Number 2) The 4U Vibrating Cock Ring

A weird but effective shape
Looking for something a bit more interesting, well try this out. For around 30 dollars you can get the 4U cock ring.
What’s good?
1. Stronger erection- This penis ring is great for a getting a stronger fuller erection. Your baby will love it!
2. Great clit vibrations- The shape of this ring may look weird but it has been made this way to stimulate the clitrus in the best possible way. The vibrations will also work nicely on the shaft of your penis.
3. Can be sterilized- If you want to use this with multiply partners you can as it can be sterlized.