Warmer Neck Ring [with Muffler] Product Features ■ Warmer Neck Ring (with muffler) ■ Eco-friendly hand warmer that requires no batteries, activated with a simple click ■ Warms up to approximately 50 degrees Celsius in about 10 seconds ■ Eco-friendly hand warmer that can be reused by boiling when cooled (approximately 300 times) ■ Maintains a moderate temperature for approximately 60 minutes ■ Comes with a muffler-style cover that blends in with your outfit, making the neck ring unnoticeable ■ Can be used in various situations, such as commuting, going to school, and outdoor activities ■ Eco-friendly hand warmer that requires no batteries, activated with a simple click [How to Use] ・Press the metal button inside until you hear a click (Always use with the cover on) [How to Regenerate] ・Boil in boiling water (Do not heat in a microwave) ※ Duration (approx.): 60 minutes ※ Boiling time (approx.): 5 minutes