An anal vibrator is a sex toy meant for sexual stimulation of anal area. Basically, all anal vibrators have one common feature - they produce a vibrating effect in the anus for pleasurable sensations. As other anal toys, anal vibrators differ from other types of vibrators by having a flared base to prevent its possible loss in the rectum. The average size of anal vibrator is smaller than vibrators intended for vaginal penetration and may vary from 4-6 inches long and about 1 inch wide. As well as other vibrators designed for external and internal stimulation, anal vibrators are usually battery operated: the batteries may be inside the unit or connected by wire to a power power pack.