December in New Jersey isn’t for the faint of heart. Winter weather is starting to take the state by storm, and the “feels like freezing” forecast is looking bitter .

That’s why one small gadget — the Lerat Rechargeable Hand Warmers — has quietly become a winter essential, and more than 70,000 packs have sold on Amazon over the past month.

Lerat 2-Pack Rechargeable Hand Warmers $12

The 2-pack is available for as little as $12 and up to $15 (down from $25), if you want a posher black and white colorblocked look. Buy Now on Amazon

For as little as $12, these pocket-sized lifesavers heat up in seconds to a toasty 131 degrees Fahrenheit and keep the warmth coming for up to six hours.

They’re slim enough to slip into a coat pocket or gloves, and each pack includes two — so you c

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