Comfortable design: Perfect fit in the palm of your hand for comfortable warmth. Gently press and heat up quickly in three seconds, ensuring an easy and comfortable experience. Fast heating: Uses precise temperature detection to provide faster and more sensitive heating. We offer you three temperature options, from 45°C to 55°C. The battery life is longer, up to 8 hours. True comfort: Smooth and warm surface, pocket-sized, curved body, fashionable and lightweight, silicone corner protection to prevent drops. This is all you need. High power: Save your phone. No matter where you are, you can charge your phone or tablet. This is a fashionable, exquisite and smooth hand warmer suitable for outdoor camping, fishing and skiing in winter. 5000mAh large capacity. The second generation graphene black technology heats up faster in 3 seconds. Automatic shutdown for safety protection. Balanced heat dissipation, intelligent monitoring of heating temperature at all times, heating to a temperature suitable for the human body, providing warmth and peace of mind. PI constant temperature surface. Heating plate. Temperature-sensitive/pressure-sensitive heat balance. Sensor (millisecond level). Central control chip. PI constant temperature curved factory heating element --RYLPYR