The Echo's phallic head is multiplied all down the shaft for those who desire the exquisite feelings of mounds and valleys. The shaft's length is 6.5in with a diameter of 1.5. This is a 100% silicone, hypoallergenic, no smell and no taste vibrator. It is bleachable and can even be boiled. The variable speed 2in x 1in Micro-Mini Massager uses three watch batteries, which are included for your convenience. Your sounds of pleasure will Echo back to you!