The UT3 Pro offers a curved heating surface for better skin contact and efficient heat distribution. Its easy-to-grip design and double-sided heating with four levels of heat up to 58 degrees make it an ideal companion for daily activities and adventures.Ocoopa UT3 PRO - Rechargeable Hand Warmer Features: Smart Magnetic Tech: Real double-sided heating hand warmers is coming Upon snapping, the external side continues to heat while the internal heating is paused to ensure safety and energy efficiency. When separated, both sides activate heating, providing all-around warmth. Long Battery Life: With an enhanced 5000mAh x2 rechargeable battery capacity and performance, enjoy 6-15 hours of continuous heat, ideal for all-day outdoor activities. This handwarmer also functions as a power bank, capable of charging your phone over 3.5 times. 3S Quick Heating: Upgraded with 4-level temperature adjustment. This electric hand warmer offering a wider temperature ranging from 38°C to 58°C(100-136°F), and equipped with a memory function to maximise your experience. Ergonomic Design: 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. Durable and Safe: Advanced materials and officially certified batteries ensure absolute safety and lasts longer and stronger than ever. This hand warmer with USB-C charging port supports fast charging and fully charges only 3 hours.