Hi,
I got something, I did this years before most thought of it….
Take a dog barking electro-collar and convert it into a Cock Ring, Then you can move the electric shock pain up or down, but trust me……you click that, and your slave will come flying in the room, and fast..
You can buy them, for $20 to $35 Dollars….And, if there’s any noise, i usually get in there and stop that…so you can push the buttons in front of people, and nobody will hear anything.
Curtis