If you're braving the cold during the polar vortex that's skating across much of the US right now, you're probably looking ...

But not so with the Go Warmer ... miniature heater that the manufacturer claims can bring its surface temperature up to 48 °C (120 °F) for several hours. You can hold in in your hand, put ...

This hand warmer from Amazon comes with a convenient carry strap and pouch. It looks sleek but quite chunky - like a desktop computer mouse - and it was relatively heavy. It heated up within a few ...