The Dr. Laura Berman Intimate Basics Collection is designed by women, for women! This vibrating partners kit has 8 functions of vibration, pulsation and escalation. It has two interchangeable vibrating bullets that attach to the controller with plug-in jack, and you can use with or with out the stretchy enhancement ring with stimulation ticklers. The ergonomically designed controller has a non-slip grip. Product is made of ABS and PU Cote materials which means it's body-safe and Phthalates free. Requires 3 x AAA batteries (not included). Dimensions: 2.25 in x 1 in (large bullet), 1.25 in x .5 in (small bullet), 2.25 in x 2.25 in (enhancement ring).