Ravean

Ravean Electric Hand Warmers
Kickstarter
Tech & Gadgets

Its simple single button function lets you dial in just the right amount of heat to keep your digits toasty no matter what environment you’re in. Varying by conditions, it produces a massive heat output run time of 8+ hours on low, 4.5+ hours on medium and 3+ hours on its highest heat setting. The colored indicator light lets you know where your heat level is at. The adjacent LEDs indicate your battery level.