The SereneLife Hot Stone Massage Kit – Water-Free Heater Bag with 12 Basalt Stones - Hot Stone Massage Kit with 12 Basalt Stones - Basalt Stones Retains Heat Longer for Best Massage Therapy - Water-Free Stone Heater Does not Build-Up Lime or Scale - Large Heating Surface Allow Layout of Stones for Even Heating - Anti-Over Heating: Shut-Off After Desired Temp is Reached - Heating Bag Keeps Stones at Constant Temperature - Digital Controlled Temperature for Safe Heating of Stones - Storage / Travel Bag Doubles as Stone Heating Oven - Portable: Plugs in Any Outlet, Comes with Car Lighter Adapter - Digital LCD Display with Selectable Temperature Setting - Energy Efficient: Heats Up Fast and Retains Heat Longer - Heated Stone Massage Relieves Pain Cause by Sprain, Strain or Stress - Ideal for Athletes, Home Care and Spa Centers - What’s in the Box: - Hot Stone Heating Bag - Digital Temp Controller.