Use Vibro-Pod with your favorite MP3 player to experience powerful rhythmic sensations that groove to the beat of the music. Don't have an MP3 player? Simply switch to the 8-function mode for 8 patterns of vibration, pulsation, and escalation. Includes a non-slip Rubber-Cote battery pack, EZ touch on/off and speed controls, 2 interchangeable Rubber-Cote bullets, extra-long cords, convenient clothing clip, and a handy travel pouch. Instructions included. Requires 2 AAA batteries, not included.