REVHAMMER shaft-strapped shaker is a COCKRING plus shaft-ring that puts the vibe shaftwise, lengthwise up on top, its got a rubbery front nub that seeks to aim at any hole you wanna f*ck—every thrust missiles the buzz-vibe up against the gape-lips...or even the BJ's pucker...REVHAMMER sends vibe into the both your shaft and the lucky shaftee. Good stuff! Every thrust moves the hummy-buzz deeper, closer to its target...the boys at hünkyjunk wanted a piece of vibe-gear you feel f*cking and feel getting f*cked. REVHAMMER straps on with a rubbery cockring in back, the vibe lays on top of your dick and the front ring stretches around your shaft about 1-1.5” from the base. The rings secure the reverb-vibe for lots of hard play. HOW TO: a bit of light lube on your junk, slide your junk through front bigger ring, your shaft through the smaller ring. Click the waterproof, silicone sealed buzz-vibe on and hammer away. VIBE UNIT: 3 button batteries give 5-7 hours buzzf*cking vibing. Battery size: LR44, comes with three.