STRONIC ZWEI is a PULSATOR, not a vibrator. STRONIC ZWEI delivers thrusting motions (back and forth movements) as opposed to the buzz generated by vibrators. STRONIC ZWEI is unisex (fit for anal or vaginal play.) The STRONIC ZWEI's concept is based on an effect which totally differs from the standard high frequency vibrators. It goes for deep satisfaction with deep frequencies in connection with a back and forth motion which feels natural. The thrust impulses can be adjusted to ten rhythms, from lightly stimulating to very powerful.