20,000 mAh capacity — large enough to charge a typical smartphone multiple times. 
• Dual outputs and dual inputs in many models: USB-A + Type-C output; Micro-USB & Type-C input.
• Some fast-charging support (for example “15W Type-C output” in the T162 version) and safety features (over-current, short-circuit protection).
• Warranty support: e.g., 12 months warranty via service centre (Carlcare) in Nigeria.