10000 mAh Charging Case Our electric hand warmer with a Large capacity rechargeable charging box offers an impressive standby time of up to 40 hours. It can be charged anytime and anywhere. Designed with built-in short-circuit protection and an automatic shut-off function when the temperature reaches 60 C, this hand warmer ensures both safety and reliability. Double the warmth Purchase one set and receive two independent double-sided heating hand warmers! Each warmer is equipped with the latest AI smart chip that precisely controls the temperature. With three adjustable heat settings, you can easily choose the perfect warmth for any situation. Ergonomic & Portable Design :Designed with comfort in mind, the hand warmers rechargeable features a compact, ergonomic shape that fits perfectly in your palms and an anti-slip design for added security.