Wireless auxiliary external battery, 4.000 mAh charging capacity, with body in resistant aluminum. USB output, including micro USB charging cable and compatible with devices equipped with wireless charging technology. Presented in an attractive design box and available in a wide range of colors. The 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.