Warm up cold fingers fast with Ocoopa’s Quick Charge Hand Warmer, a mouse-like hand heater boasting 10K mAh of power, 15 hour battery life, and best of all it offers 3 heat settings from 95º-131º to ensure toasty digits in frigid weather. Recharges to full in just 3 hours. The battery will also power up your phone with QuickCharge 3.0, charging your device up to 50% in just thirty minutes.