DON'T WASTE YOUR MONEY!
Update* I sent these back on 2/15/21 & still havent gotten my money back!<br /><br />They don't hold a charge, so can only heat your feet while you're sitting & actually plugged into the charger.  No off/on switch, no batteries or anything to hold a charge & they only reach the "temperature of human body"...... which is just barely warm. Totally junk.
Rating: 1 stars