Good battery capacity — 20,000 mAh: Enough to recharge a typical smartphone 1–2 times (depending on its battery size), or a phone + some other small devices (earbuds, small power‐hungry device) before needing recharge.
Detachable 4‐in‐1 charging cables included: Comes with multiple cables (USB‐C, Micro USB, Lightning, etc.), so it works with a wide variety of devices without you needing to carry extra cables.
Dual (or multiple) output ports — you can charge at least two devices at once.
Built‐in LED light / camping lamp feature — handy for emergencies, outdoors, power outages, or night‐time use (e.g. camping, reading, walking at night).
Digital/LED display (battery indicator) — lets you see roughly how much charge remains (e.g. 25 % / 50 % / 75 % / 100 %) so you know when to recharge the power bank itself.