Vibrating massage products all use a rotating electric motor with an offset weight to generate vibrations. Most use inexpensive stock motors originally designed for cell phones and other applications; their speed and power characteristics have not been designed or tuned for sexual stimulation. Most operate at too high a frequency, creating an irritating high-pitched buzzing sensation.

Developing an intimate massager with a more satisfying low frequency rumble across a range of power settings requires custom-engineered, high-quality motors that will operate quietly and not burn out quickly. That means superior bearings, gold contacts, expensive tungsten (not lead!) weights, high-efficiency designs, tight tolerances and uncompromising quality assurance processes. With motors, as with most things, you get what you pay for.