Innovation at your fingertips: our rechargeable electronic pocket heater heats up both sides in 3 seconds to keep your hands warm. It has a 2A grade battery and an innovative LED digital screen that shows the charge status and temperature range. With an adjustable temperature range of 35-55°C (95-131°F), you can adjust the temperature of the hand warmer to whatever level you need, without being limited to the traditional 2-3 temperature settings. Simply charge the device for 2-3 hours and you can enjoy 4-8 hours of warm hands. Perfect for winter hikes or commuting on cold mornings. In addition, our battery has 3 built-in temperature sensors to ensure your safety and global business insurance. Its surface is made of aircraft aluminium for excellent thermal conductivity and heat dissipation