Oraimo OPB-P204DQ Traveler 4 Pro 20000mAh Power Bank has an Ultra-High capacity of 20,000mAh that can charge for days. Oraimo OPB-P202D equipped with Dual Output allows users to charge 2 devices at a time. Fas.t Charging 2.1 A technology supports fas.t charging. Portable design is ideal for carrying anywhere to charge a Smartphone. Battery Cell Type Specifications: Lithium Polymer Capacity: 20,000mAh Rated Input: DC 5.0V = 2A Rated Output: DC 5.0V = 1A / 5.0V = 2.1A (max) Dimension: 139.5 * 64.5 * 23.5mm