This is the creme de la creme of cock rings that puts all others to shame! 

Features 7 vibration modes, an electric shock function (2 intensities) and a wireless remote. Made from soft stretchy silicone and ABS plastic, so the device is waterproof. It is super quiet at only 50 db and it measures 34 mm on the inner diameter. The lithium battery allows for fast charging with the provided USB charge cable.