Expandable Vibrating Butt Bust Inflatable ribbed butt plug expands with air to provide girth and volume. Dual power control with extra strong vibrations. Quick release allows instant deflation. Expands to 12 inches in circumference. 5.5 inches length. Vibrating sex toy requires C batteries. not included. Do not leave batteries in the vibrator between uses. Always clean before and after use. Expandable Vibrating Butt Bust from Nasstoys of New York.