DIONI was designed to transform your finger into the ultimate pleasure instrument. By harmoniously blending human interaction and electrifying vibrations, DIONI bridges the gap between technology and touch. Features: 20 VIBRATION MODES ERGONOMIC SHAPE BOOST FUNCTION 100% PREMIUM SILICONE MAGNETIC CHARGING SPLASHPROOF SPECIFICATIONS Material: Premium Silicone, ABS Plastic Battery: Li-ion Charging Voltage: 3.7 V/300 mAh Waterproof Rating: IPX6 Weight: 189 g Run Time: Approx 60 minutes Charge Time: Approx 90 minutesSize Large best fit for ring size 8.5 and larger