This unique device simply wraps around the shaft (or your balls) and all you have to do is secure it with the Velcro and pump it up to your desired squeeze!! This has been copied from the blood pressure pump, except in a smaller scale.  To release the air from the small air bag, simply turn the small thumb screw to the left. To inflate, just tighten the thumb screw.  :)

 A great way to keep your tool hard while e-stimming or any other activity you choose. :)  Place a piece of conductive strip under it and turn it into a two-fold device; stay hard and secure and electrode !!

        Shown Inflated