The F4 is similar in design and the soft sensual feel to the female body.vGentle curves with an ergonomically shaped tip and a distinct line emphasize the feminine style. Versatile, powerful vibration levels can be individually and easily set with the distinctive, shiny control element. Due to its inverted base the vibrator can be placed vertically on a flat surface. The base also contains the tightly sealed battery compartment, which can be easily opened with the enclosed, puristic opener. The body, which is made from skin-friendly, silky smooth, silicone ensures safety when in use.