Size (D × W × H inches): 1.3 × 1.3 × 5
Vibration Settings: 3 Speeds, 1 Pattern
Materials: Bodysafe silicone, ABS
Features iroha's Soft-Touch silicone and dust-proof coating
Battery-powered. Requires 2 AAA batteries (tester batteries included)
Running Time: Approx. 4 hours (Max Strength)
Waterproof up to 50cm / 20"
I actually really like the iroha zen. Even though I've had 2 now and they've both stopped working after less than a year, I was still considering getting another one. I wish they would come out with similar textures in better build quality.