Choreograph your dance to the rhythmic beads and the beat of the dolphin. 8 independent levels of vibration, pulsation, and escalation plus 8 speeds of shaft rotation with non-jamming synchronous beads. EZ load battery case, soft touch controls, LED function lights. Easy-to-use one touch on/off button turns off any function. Total length is 10 inches with an insertable length of 5.25 inches. Requires 4 AA batteries not included.