Tantus Echo Silicone Vibe that lovely feeling of penetration is multiplied over and over down the entire shaft, for constant g-spot pleasure or to resist against, using the protrusions to exercise your PC muscles. The barrier pop can be felt over and over. The smooth shape makes it comfortable in action. Uses 1 x 1.5 NV Type Battery. Diameter 1.55", Insertable Length 6.5".