Echo's phallic head is multiplied all the way down the shaft, for constant g-spot pleasure or to resist against, using the protrusions to exercise your PC muscles. Single Speed Removable Waterproof Bullet Vibe, Uses 1 x 1.5 NV Type Battery. Made from Tantus’ own unique formula of 100% Ultra-Premium Silicone. Eco-Friendly, Hypoallergenic, Hygienic, Boilable, Bleachable and Dishwasher Safe.