Product Name G-301 Product explain 1) This style is the smallestauto-changeable speed vibrating ring in the world. Special designed stimulator can stimulate female clit for reaching climax. 2) The product is designed with special silicone gel ring. It can effectively prolong ejaculation of man, last erection and hold firmer, increase pleasure of woman climax. 3) Waterproof, durative intensive vibrations for 60 minutes, battery can be changed for reuse. 4) We have patent for the product in China mainland, Taiwan, Japan, USA and European Union.