[Double-side Fast Heating]: Our reusable electronic hand warmers deliver double-sided heat to your hands in just 3 seconds. It features an innovative LED digital screen to show the level of charge and temperature range, as well as a double A-grade battery. [Temp Modes Adjustable]: Rechargeable Hand warmers offer you a instant double-sided heat in just 3 sencods. 3 levels of temperatures 40/104F-50/122F-60/140F at your choice. Simply charge the device for 2-3 hours and enjoy having cozy hands for 4-8 hours! Perfect for winter hikes or cold morning commutes. [High-end Device]: Hand warmer, power bank and massage are integrated for your enjoyment. This 4000mAh Portable Pocket Hand Warmers featuring a USB Type C/USB Output/Micro-USB charging port. A multi-functional device, it features a sleek, compact design the perfect travel companion! [Warm Winter Gift]: Our Long Lasting Heating Portable Hand Warmers is great for raynauds arthritis sufferers and will help you brave bitter temperatures on your outdoor adventures. It's a MUST HAVE to spend a cold winter, especially for pain relief for heat therapy needs. Gift for Birthday, Mother & Father's Day, Thanksgiving Day, Christmas, Valentine's Day. [Safety & Package Include]: Unlike other electronic hand warmers, with global commercial insurance, our battery has 3 built-in temperature sensors to guarantee its safety and global commercial insurance. Its surfaces are made from aviation aluminum with excellent thermal conductivity and heat dissipation performance. You will get 1* Hand Warmers, 1* USB Cable.