Fast charging on the go: The external battery provides power to smartphones, tablets, Bluetooth speakers, and other mobile devices—whether in the office, on a plane, or at the beach. The power pack delivers a boost of energy while traveling; the portable charger can charge two devices simultaneously. The LED function indicator provides information about the device status. The optimized charging process protects the battery and extends the lifespan of your phone, tablet, and more. Certified cells ensure the highest quality and safe charging: overcharge, overvoltage, overheating, and short-circuit protection. Maximum compatibility for all phones, tablets, and other devices, such as smartwatches, digital cameras, or Bluetooth headphones. A single charge of the powerful battery pack is enough to use the Samsung Galaxy S21+ for an additional 85 hours. The power pack is fully charged in 6 hours via the USB-C port. 2 inputs: USB-C and Micro-USB. 2 outputs: 2x USB A.