This Health Touch Back Massager works in the car, home, or office. The massager features a car adaptor (12 volt) and a electric adaptor for home or office. It is soft to the touch, easy to use, and portable. Being portable and light weight, it can be used in any dry environment in the aforementioned areas. Maintenance is not required as there are not user serviceable parts. Observe all safety requirements including shutting down the unit when not in use. Not recommended for children or the elderly. Never use while sleeping and avoid falling asleep while the product is operating.