1.[2-in-1 Magnetic Hand Warmer] This rechargeable hand warmer has a strong magnetic function that allows you to put them together like a palm-sized hand warmer, or separate them effortlessly. It features an ergonomic design, comfortable to wear, easy to grip, and a cute bulldog pattern. It has a certified temperature control chip, and the outer material is smooth and warm with thousands of polishes. One button does it all. It is pocket-sized, compact, extremely convenient to carry or store, and emits constant heat while keeping the blood flowing. 2.[3 seconds instant heat, 4 heating levels] It releases heat in just 3 seconds, provides double-sided heating from comfortable warmth to 143°F high temperature operating temperature, and has a built-in 4-level setting that provides adjustable, precise, stable and most comfortable heat. Four indicator lights intuitively tell you the remaining battery power (blue) and heating status (red). 3.[18 Hours of Longer-Lasting Warmth] It has a built-in large rechargeable 6000mAh battery capacity, which allows the hand warmer to generate a lot of heat and run for up to 18+ hours at a comfortable 1 or 2 level setting. It can easily meet your needs for activities such as camping, traveling, golf, hunting, or indoor/outdoor activities all day. And it comes with a split USB-C charging cable to save your charging time, ensuring you experience more warm moments in the colder months. 4.[Safety Guarantee and High Performance] The 2024 upgraded version of the rechargeable hand warmer uses a premium AI smart chipset to control the heat level, and is made of high-tech aviation-grade aluminum and ABS materials, certified by UL, FCC, CE, and enhanced with multiple protection technologies to prevent overheating and short circuits. It is fireproof, explosion-proof, and radiation-free. It is durable and keeps you and your loved ones warmer.