AICNLY Hot Stones Massage Set with Temperature Adjustment-20 Pcs Basalt Hot Stones with Heater Kit, Professional Massage Tool for Spa-Lymphatic Drainage, Relieve Tension and Muscle PainFunction of the Heating BoxThe heating box is designed to provide a safe and convenient way to heat the heating stone. It features 7 temperature control switches, temperature range of 96 F to 156 F. The timer shutdown function allows you to set the heating box to turn off automatically after 30,40,50,60,70,80,90, min. High Quality Natural Basalt StonesExperience the ultimate relaxation with our set of 20 high quality natural basalt stones, carefully