The PR-2X Light and Sound Mind Machine is a Professional Desktop System with a Metal outer Casing. This Light and Sound System has a built-in rechargeable battery, is two user capable, and has a LIFE-TIME warranty! If you are interested in meditation, hypnosis, or deep relaxation as a means of stress reduction and self improvement you will love the Light and Sound Mind Machine experience. Experience in minutes what used to take years of practice. Light and Sound Machines (often called Mind Machines) generate gentle flickering lights and pulsing sounds that are specially tuned to calm your mind and body, and help you reach an optimal state of focused relaxation. Just choose from the pre-programmed sessions ranging in length from 10 to 60 minutes. You will remain alert, calm, and in full control. Light and sound machines are powerful tools for activating the mind, achieving deep levels of concentration and relaxation, sparking creativity and preparing for stressful events like public speaking, examinations and long trips.