With the push of a button, Swell adheres perfectly to the skin with a strong automatic suction seal for hands free fun just place the transparent cups over each nipple, power on, and watch them grow. Powerful multi-function vibrations with separate controls for each cup raise the intensity even higher, while simple controls make Swell incredible for solo or partner play. Features: individually controlled vibrating cups. 7 functions, multi-speed. Powerful auto pump suction. Air release button for fast, safe removal. Visually stimulating clear nipple cups. 3 LED power indicators. Phthalate free. Body safe. Specifications: color black. UPC Code 782421064945. Width, diameter 2.25 inches. Vibrating nipple sucker requires 2 AA batteries, not included. 7 multi-functions. Materials Thermoplastic Elastomers TPE, ABS plastic.