Photographer's equipment-what is something like a small notebook?

Is a digital companion, can browse the photos in the memory card at any time, and can back up the photos in the memory card.

Digital companion has a large RAM, which allows you to browse and enlarge photos in real time, which is much larger than the magnification of the camera display screen. Digital companion usually has a built-in notebook hard disk or solid-state hard disk, which has a large storage space and can store many photos and pictures. One more thing, the professional digital companion has high security, which can ensure that the photo materials are not lost or damaged.