Suction On Your Command! Vacuum control at your fingertips! The TENGA Vacuum Controller allows you to manipulate vacuum pressure inside TENGA CUP Series items through a simple button-press! Experience Suction like none other! ??? Vacuum strength sensation is subjective and may differ from person to person. ??? Batteries Sold Separately ??? ONLY Compatible with Vacuum Compatible CUP Products. Non-compatible items may cause damage.