You can use the ring face down to stimulate the scrotum or face up to stimulate the clitoris during play. OTO has 20 speeds, from strong to gentle, and is completely odorless and waterproof. The ring is made of silky silicone and has a perfect shape. You can play for up to two hours on a full charge. Silent. Material: Medical grade silicone. Weight: 41 grams. Battery: 200mAh (USB rechargeable). Battery type: Lithium-ion. It fully recharges in two hours and has an autonomy of 65 minutes on high power. 20 speeds.