3. Big O by Screaming O
Screaming O expanded their product line and offers more powerful vibrating rings. The Big O is an escalation of the theme. It has a beaded erection band which helps keep the hard-on hard for a long time. It has an 8 speed stimulator. Push the button once for a steady on operation and press it again for pulsating action. This waterproof unit lasts 80 minutes on a single AG10 replaceable battery. 80 minutes is more than enough time for a single session. If the girl doesn’t get off on this, nothing will.