Description:
Easy to use.USB power or electric adaptor,output 5v=1A,2A.When first ,it may takes 1-3 minutes to heated and warm your shoes. 
Use adaptor will heating more faster and warm.
When you pull out the USB cable from USB device,slippers will stop heating.
One pair slippers comes with 2 heating carbon fiber heating pads.You can take out the heating when want to wash your slippers.
USB power suply,such as pc,notebook.cellphone adaptor.
Heating temperature may affect the cold weather outside,usually heated about 113℉(Reference ).