Sinclair Institute Select Invisi-Vibe is a clitoral vibrator designed to be used discreetly. Contoured curves work with her anatomy to keep the vibe in place. Can even be worn inside panties. Features a removable, 3 speed push-4-play, silky smooth bullet that can be used alone or with Invisi-Vibe. Pleasure bumps along the phthalate-free jelly enhance sensations. 33/4 x 13/4. Water-resistant. Uses 2 AG5 watch batteries (included).