Detailed Product Description there are 220V & 110V of the heater bag,we will ship to you according to your country Usage:after plug in 25-60 minutes then you have to cut off the power   Beneficial of this JADE GLAZE   if you open a Salon club,it is good for you buy one set do massage. there are severial benefits for your customers and massagist Benefits for customer: 1,Nourishing skin 2.Calm the nerves 3.Relaxation 4.Heating stones help relxa muscle 5.Dredge meridians and acupoints 6.Relieving pain 7.Refreshing brain 8.Improve brain function 9.Makes people energetic   Benefits for massagist 1.if you use jades to massage it only take 2-3 minutes to relax customer's muscle. 2.reduce massagist's hand powerbecause of the heating stones make muclse more soft 3.Heating jades can help you to calm customer nerves 4.it can warm joints 5.the jade can relax massagist when massagist use that ,they can  also absorb the jades heating,you can put the heating jade on your joints and muscle or seat on the heating jade.it can help massgist to relax from the tired of whole day working 6.improve the competitiveness of you beauty.