Mental Sense w/ Ball
Do away with your PK Rings! This is an electronic accessory that you could work into any effect where the use of magnets are employed.
It is a vibration unit. It can be worn comfortably under your clothing.
Just one possible effect with so many more uses:
A ball is given to a spectator, they can freely choose which hand to hold the ball. The magician can, without touching the spectator, tell which helper has the ball and can tell them which hand it is in.
It can be perform anytime anywhere and repeat performing without reset, this is a very cool piece of mentalism and magic!