Features1SOLDER FREE: With solder free design, it is convenient for users to install 4 x 21700 batteries in the mobile power case for easy battery replacement in the future. 2HIGH POWER SUPPORT: The power bank case supports a maximum power of 22.5W plus 15W, which meets the user's charging needs for high power devices. 3SUPPORT MULTIPLE FAST CHARGING PROTOCOLS: Supports multiple fast charging protocols, including for PPS, PD3.0, PD2.0, QC4+, QC4, QC3.0, QC2.0, AFC, FCP, SCP, PE2.0, PE1.1, SFCP, and so on. 4SAFETY PROTECTION FUNCTION: Input support over voltage and under voltage protection, output support over current, over voltage and short circuit protection, battery over charging, over discharging and over current protection, IC over temperature protection, etc. 5WIRELESS CHARGING FUNCTION: Users can place the devices on the mobile power case to realize wireless charging, providing a more convenient charging method.SpecificationItem Type: 4x21700 Battery Power Bank ShellMaterial: ABSWeight: Approx. 135g / 4.8ozBattery Box Specification: 4x21700 Batteries, Support Maximum Capacity 20000mAh(Battery Excluded), Support 4.2, 4.35, 4.4, 4.5V Battery Type.Output Fast Charging Protocol: Support For PPS, PD3.0, PD2.0, Support For QC4+, QC4, QC3.0, QC2.0, Support For AFC, FCP, SCP, PE2.0, PE1.1, SFCPInput Fast Charging Protocol: Support For PD3.0, PD2.0, Support For AFC, FCPSupport: 22.5W, 15W Wireless ChargingInput: Overvoltage, Undervoltage ProtectionOutput: Over Current, Over Voltage, Short Circuit Protection, Battery Over Charge, Over Discharge, Over Current Protection, IC Over Temperature Protection.Package List1 xPowerBankBox4 x Screw1 x Screwdriver