The Iroha Rin’s shape is easy to hold and the soft spherical tip provides brand new sensations. Simple one button control cycles through 4 vibration modes. 3 vibration and 1 pulsation. Fully waterproof. Size 1.3 inches in depth, 1.38 inches in width, 5.83 inches in height. Materials Body safe silicone, ABS plastic. Battery powered massager requires 2 AAA batteries, not included. Running time approximately 4 hours at maximum strength. Waterproof up to 20 inches.