Magnetic Intelligent technology: True double-sided Heating hand warmers is coming! Upon snapping, the external side continues to heat while the internal heating is paused. When separated, both sides of each one activate heating, providing all-around warmth. Longer Lasting Warmth: Upgraded 10000mAh rechargeable battery capacity and performance,providing up to 12 hours of Heat, suitable for all-day outdoor activities with unlimited. Also, Can be used as a power bank, charging over 3.5 times for your Phone Best Warming Experience: Upgraded with 4-level temperature adjustment, 3S quick heating, This electric hand warmer offering a wider temperature ranging from 38 C to 58 C(100-136 F).We simplify your operation by remembering the previous heating level you selected and switching to it the following time Ultimate in Ergonomics: Through hundreds of refinements, Just for a comfortable grip.You'll have an awesome grip feel a with velvety smoothness surface and slim waist in hand Made to last: Advanced materials and officially certified batteries ensure absolute safety and lasts longer and stronger than ever. UT3 PRO will make an excellent gift for golfers, campers, hunters, hikers, and other outdoor enthusiasts.