1. support PD fast charging 2. Battery power can be viewed 3. for Mini 3 4 Pro / Mini 3 4 battery can be converted into a rechargeable battery to charge other USB devices. 4. Charging: Up to 4 batteries can be put in (for Mini3 Pro standard battery and long-lasting battery can be together). 5. Storage mode: long press the function button for 2 seconds in charging mode to switch to storage charging mode. Storage mode can charge the battery with less than 62% power to 62% and then stop automatically, which is Perfect for long-term battery storage. Tip: only the battery below 62% of the power storage charging, power 62% can not use the storage function. Specification: output: 8.5V/3.5A x 2 Single output: 8.5V/3.5A USB output: 5V/2.0A (max) Input: 5V-15V/3A; 20V/3.25A Notice: Input PD45W 2 batteries can be at the same time (for specific charging methods, please refer to the product image); Input Less than PD45W Single batteries are in turn, with the battery with high power charging priority for Mini 3 4 PRO Material: plastic colour: Gray Package Contents: 1 x USB-A to USB-C charging cable 1 x USB-C to USB-C charging cable 1 x 4 in 1 Charger Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.