Twice the vibration means twice the fun and twice the pleasure. Instead of having one bullet, you have two bullets wired to the same control Now you can stimulate and pleasure two different erogenous zones simultaneously from one control. Or you can share the fun and have your partner use one bullet while you use the other. Measurements: Each bullet is approximately 2.125 inches in length and 3.25 inches in circumference. Note: Uses 2-AA batteries, Not Included.