Rock-hard, ultra-sensitive nipples and heightened arousal are just a touch away. With the push of a button, Swell adheres perfectly to the skin with a strong automatic suction seal for hands-free fun - just place the transparent cups over each nipple, power on, and watch them grow. Powerful multi-function vibrations with separate controls for each cup raise the intensity even higher, while simple controls make Swell incredible for play with your spouse.