4,000 mAh external auxiliary battery made of aluminum. With USB output and, Type C output and input. LED charge status indicators and charging cable included. Available in elegant colors and presented in an individual kraft design box, with a manual in Spanish and English. Micro USB Input: 5V DC 1st USB Output: 5V DC 1AThe capacities shown in all our external auxiliary batteries are real, all of them contain grade A and non-recycled batteries, with a lifespan of at least 500 charge cycles and according to CE regulations. In addition, they are manufactured in accordance with RoHS standards and in compliance with the following safety requirements:Overload protection system for the power bank. Full discharge protection system that provides greater durability to the power bank. Locking system to prevent short circuits. Constant charge transfer system, according to the capacity of the target device. 4000 mAh. USB output. Micro USB input.