6,000 mAh, high charging capacity external auxiliary battery. In aluminum, with dual USB output for charging two devices simultaneously, charging indicators and micro USB cable. Curved design and with a large printing surface, especially recommended for laser. Presented in an attractive box. 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.