Want a little vibration with your penetration? Want a little help keeping your stiffy stiff? The Big O is here to help! Made of silicone, the Big O is a cockring with lots of nubbies to stimulate those "O" so sensitive erogenous areas and help keep your favorite penis "O" so erect. The vibration lasts for approximately 80 minutes, but when batteries go dead and your soldier is ready to march on, simply replace the batteries and you will have another 80 minutes of erotic fun. The handy on and off switch allows one to use this tool of pleasure on multiple occassions for multiple fun and games. Batteries included. Use with your favorite silicone compatible lubricant. Enjoy! This product ships FREE!