The Porn Hub Vibrating Tighten Up Ring is as simple as they get but do not equate that simplicity with inferiority for many simple things are simply genius.
The unit is made from phthalate free ABS plastic and silicone and it employs an adjustable cinch style lasso to perform the constriction. The spring loaded cinch toggle is easy to manipulate and adjustments can be done on the fly. The removable 7-speed bullet vibrator can also be slipped in or removed on the fly. You can use it separately or in conjunction with the ring. The bullet holder also features some love-nubs for extra stimulation. Being waterproof, you can take it to wet areas without worrying about ruining it.
This product ships with 3 (LR44) button cell batteries so you can get started right away.