6-Quart Digital Massage Stone Heater warms and maintain the heat of hot stones for massage therapy at a temperature up to 160 degrees. A slotted wooden spoon is included for easy transfer of the hot stones. Constructed of long-lasting, rust-free steel and aluminum. To use: Place a towel in the bottom of the water reservoir and lay stones on top of the towel. Cover stones with cold water (or to the max fill line). Preheat for about 20 to 30 minutes, then use the digital temperature control to maintain temperature.