Anker 535 Power Bank (PowerCore 20K) made by Anker Innovations.
Key specifications (from the label)
• Capacity: 10,000 mAh (74 Wh)
• Battery type: Li-ion
• Ports:
• USB-C (2 ports): Input & Output (fast charging supported)
• USB-A (1 port): Output
• Total output: Up to 5V ⎓ 4.8A (shared across ports)
• Fast charging: Supports multiple voltage levels (5V / 9V / 12V / 15V / 20V)
Can charge most smartphones 4–6 times depending on the phone battery size.
• Can charge tablets 1–2 times.
• Can also charge some USB-C laptops (slowly or for partial top-ups).