Battery operated vibrators
are probably the most well known type of sex toy. They're inexpensive,
portable and offer gentle vibrations (popular with those who find
electric (plug-in) vibrators overwhelming). However, most are
designed as novelties with an unpredictable lifespan: from one
week to several years. Hard plastic vibrators typically are more
powerful than vinyl or rubber ones.
Many women enjoy using
the cylindrical models for vaginal insertion as well as clitoral
stimulation. Length is measured from the top of the base to the
tip of the vibrator.