A vibrating silicone butt plug! Woo-hoo! The Zing is a sizable but not ridiculously huge butt plug with a roundly tapered tip and ribbing along much of the body. It has a notch in the base for the Micro-Mini Vibrator (included - and a fun little toy on its own). The Micro-Mini Vibrator is battery-powered so there are no wires or control boxes. The Zing is 4.5 inch long, just under 1.5 inches in diameter at the widest insertable point and 1 inch in diameter at the neck. Takes three watch batteries which are included.