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 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. Small and lightweight: The portable charger fits in any bag and carry-on luggage. 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 165 hours. The power pack is fully charged in 8 hours via the USB-C port. The integrated LED display shows exactly how much power is left, from 1 to 100 percent. Input: USB-C. 3 outputs: 1x USB-C, 2x USB-A.