Unbound Zip Rechargeable Bullet Vibrator in Violet & Opal. Unbound Zip Rechargeable Bullet Vibrator in Violet & Opal. Unbound's bestselling Zip vibe is now a multi-speed and rechargeable bullet vibrator! Zip features a tip for perfectly targeted external stimulation. It is as portable as it is powerful; utilizing a tungsten steel motor with a heavy-duty rotating mass, thus providing a more intense sensation for all three speeds. Zip comes with a charging cord, booklet, and bag for easy storage.. Super smooth body safe silicone. Discreet with 3 speeds. Can be immersed in up to 1 meter of water for up to 30 minutes. UBOU-WU19. ZIPUBVB-VIOP. Since its start, Unbound has gone from being a labor of love (translation: they started it in their tiny NYC apartments) to a leader in changing how people explore and enjoy their sex lives. Through their online shop and Unbound Magazine, they believe in the radical possibilities of pleasure and that we are better when we, ahem, come together.