With 3 temperature settings and a 10,000mAh rechargeable battery, this reversible hand warmer provides 3 seconds of fast heat and up to hours of constant heat. The built-in intelligent protection system provides complete and reliable protection for the device and 2 different ports allow it to be used as a backup power source to charge 2 devices at the same time. Ideal for camping, fishing, hiking and other outdoor activities. FAST HEATING: This double-sided electric hand warmer can heat up quickly, with built-in intelligent protection system against short circuit, overheating, overloading, overcharging, overvoltage and so on. 3 SEGMENT HEATING TEMPERATURE: This hand warmer is made of aluminium alloy shell, which is impact resistant and has good thermal conductivity. With the temperature display on the screen, you can adjust the temperature from 113°F to 131°F according to the external environment with a long press on the power button. LONG LASTING BATTERY: Powered by a 10000mAh rechargeable battery that provides up to 8-10 hours of continuous heat after a full charge of approximately 4 hours. Ideal for all day outdoor activities such as camping, fishing, hiking, skiing and more. BACKUP POWER: Designed with USB and Type-C ports, it can also be used as a backup power source to charge 2 devices at the same time, compatible with most types of electrical devices. Specification： Material: ABS; Aluminium Alloy Color: Grey Charging Power: 10W Input: Type-C Port, DC 5V/2A Output: USB Port, DC 5V/3A Battery: 10000mAh Rechargeable Battery Heating Mode: Double-Sided Temperature Levels: 45°C/50°C/55°C, 113°F/122°F/131°F Heating Runtime: 10Hours(113°F), 6Hours(131°F), Fully Charged Time: 4-5Hours Type-C Charging Cable Length: 50cm/19.68in Item Size: 10.3x6x3cm/4.05x2.36x1.18in Item Weight: 202g/0.44lbs Package Size: 14x14x5cm/5.51x5.51x1.96in Package Weight: 242g/0.53lbs