External auxiliary battery with hand warmer function, made of aluminium. With ON/OFF button at the front that releases a pleasant warming effect with 3 intensity modes. 4000mAh. Type C input and output connection -cable included- and USB output to charge any device. Type C Input/Output: 5V DC - 2.4A1 USB Output: 5V DC - 2.4AThe capacities shown in all our external auxiliary batteries are real, all of them incorporating non-recycled, grade A batteries, with a service life of at least 500 charging cycles, and complying with CE regulations. In addition, they are manufactured according RoHS standards, and in compliance with the following safety requirements: Power bank overcharge protection system. Complete discharge protection system, which increases the durability of the power bank. Blocking system to prevent short circuits. Constant charging transfer system, in accordance with the capacity of the target device.