Powerful vibrating stimulator with reversible rotating beads features 7 functions of vibration, pulsation and escalation and 3 speeds of independent reversible rotation. Includes 5 rows of non-jamming synchronized rotating beads with brilliant LED lights. Shaft is 4.75 in. by 1.25 in. Stimulator is 2 in. by 1.25 in. Requires 3 AAA batteries, not included.