Excellent product at exceptional price!
With Winter approaching,  I decided to try this hand warmer.  It's exceeded all my expectations.  It charges via a supplied UPS charging cable in less than four hours.  Once charged it heats my hands to more than comfortable in only a minute or two.  In fact,  unless it's slipped into the included felt pouch,  it can get uncomfortably hot.  By adjusting the heating strength appropriately,  it warms my hands for a full 14 hours.<br />I've even bought a second which I slide to the end of my bed to warm my feet.<br /><br />Furthermore,  it's an exceptional power brick with a 9000 MAH capacity when fully charged.  Using supplied charging cables and ports,  it can power anything which uses USB2 and USB C.<br /><br />I'm extremely satisfied and have recommended it to my friends.  Finally,  it's great value for the money.
Rating: 5 stars