Go Vibe is waterproof, compact, quiet and discreet. Simply pop a battery in, twist, and feel that vibration go, go, go! Small discreet waterproof vibrator. Vibrator has a circumference of 2.83 inches around. Dimensions 4.10 inches long by 0.90 inch wide by 1.20 deep. Vibe requires 1 AA battery, not included. Always clean before and after use plus between partners. To increase the life of all sex toys remove the battery prior to storage