This rechargeable handheld hand warmer provides a warm and comfortable solution for outdoor sports, camping, and Renault patients with its excellent functionality and portable design! With a large capacity battery of 5000mAh, this handheld hand warmer can provide you with long-lasting warmth and bid farewell to the cold winter days. Charging via USB is convenient and fast, allowing you to charge anytime you need, ensuring continuouswarmth. Its compact pocket size design makes it easy to fit into a pocket or bag and carry with you. It is an ideal companion for outdoor activities, camping, and daily use. Especially for patients with Renault's disease, this handheld hand warmer can provideadditional comfort and warmth, helping to alleviate discomfort caused by cold. This hand warmer not only provides warmth, but also has safety protection functions such as overheating protection and short circuit protection, ensuring safety and reliability during use. In short, this rechargeable handheld hand warmer is a multifunctional, portable, and safe and reliable product that provides you with a warm and comfortable experience, keeping you warm throughout the cold season.