That gadget is the: handy Beyyon Rechargeable, Magnetic Electric Hand Warmer. It has four heat levels plus the battery power levels, which are shown on the two LED Displays. Each hand unit has a 5000 mAh battery which the company says can be combined to offer phone charging from the device in an emergency. Surprisingly, the hand warmer were under $10 on Amazon. (Link below.) I bought one to use as the WTHII gadget, but now that the game is over, I can start using it. (Hopefully, not for long as warm weather should be on the way to NYC But I did buy another unit for my spouse, Dennis who wanted one after he saw the demo.)
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