The Optimum Power® Masturball is a fully self-contained vibration power stroker packed with 10 functions of vibration, 3 functions of sensational compression and pressure sensitive tickler pads for a completely customizable stroking experience. Pressure sensitive squeeze pads customize tightness with every stroke, while the variety of functions tickle and tease you towards new climactic heights. Embrace fully customizable pleasure while you flicker through 10 functions of vibration with every touch of the silicone buttons. The removable open-ended chamber sleeves are easy-to-use, easy-to-clean and require no special care. Look forward to up to 1 hour of high-intensity vibrating stroking pleasure and recharge time of only 2.5 hours.