Quality ABS which is abrasion resistant, no smell, safe for the environment, will not hurt your body and easy to handle. Continuous heating: the hand warmer has a quality built-in heating elements and precises temperature control that allows continuous heating. Afters heating for three seconds, you will no longer be afraid of the cold. the hand warmer has overheating protection .USB charging is very convenient. Lanyard design: to keep the hand warmer in place, it comes with a lanyard. To avoid the heater from falling off, you can tie the lanyard around your wrist. relieve your pressure and help you sleep Small and lightweight, easy to carry lovely and beautiful. Product Description: product include：1*hand warmer [Upgraded Ergonomic] Tailor to Your Palm. We dedicate care to even millimeters with the goal to provide you with simple and comfortable heating. [Safe. Stable. Reliable] The battery's safety and lifespan are protected by the reliably series circuit, industrial-grade components, and the improved cooling design. Keep your hands warm: Warm hands can keep your hands warm and give a warm winter. Our hand warmers are lightweight and fit comfortably in your hands. Slip them into your pockets or bags and take our pocket warmers with you wherever you go, for traveling, watching football games, baseball tournaments, hunting, golf, fishing, hunting, camping, skiing, waiting for the bus, etc. Show your loved ones you care by gifting them these reusable hand warmers - a practical and thoughtful present for the winter season. It's a MUST HAVE to spend a cold winter, especially for anyone who hates icy fingers.