Both the N20 Standard, N40 Standard, and N40 Sublime use USB-PD and can be powered by a portable power bank, allowing you to take your Muro Box wherever you go.
(Note: The N20 Lite uses a traditional DC power supply and does not support this external power bank functionality.)

Compatible power bank specifications: Minimum of 45W USB-C power supply. Please use a model rated for 15V voltage and at least 3A current (45W 15V/3A).

For example, the following power bank model is one we have used in our internal testing: https://www.mi.com/tw/20000mAh-mi-power-bank-3-pro/specs/