Stone massage is a massage that places smooth, flat and heated rocks at key points on the body. Stones are placed into an electric slow-cooker or a purpose-built device, which is filled with water. The water is typically heated to 52-54 degrees Celsius (122-127 degrees Fahrenheit). Once the stones have heated sufficiently, some are placed onto specific points on the body (such as the back, hands, etc.), and others are held by the massage therapist and used to work the muscles. Certain styles of stone massage also incorporate chilled stones into the routine. These stones are usually marble. This machine is an ideal machine for heating massage stones. The Massage Stone Warmer is a professional grade massage stone heater that keeps stones at an even temperature and ready to be used. It is easy to operate and safe. What is Ozone? Ozone is also known as activated oxygen. It is not smog. Ozone is produced by nature and acts as a strong germicide. It is made up of three oxygen atoms. Because it cannot stay in this state, the third singlet atom will eventually break away and leave pure oxygen. The singlet must attach to something. Since healthy cells have a natural defense and are not affected, the singlet attaches to unhealthy cells like bacteria and viruses in order to neutralize them. In this machine, ozone acts as a germicide to kill bacteria that attached on the massage stones to ensure that you can enjoy your massage.