What tape does the PT-70BM use?

It takes Brother M-series laminated label tape. That tape is narrower and less common than the TZe tape used by larger P-Touch models, so check the cartridge code before buying refills.

Does it need batteries or a power adapter?

It runs on AAA batteries, which keeps it portable. There is no PC connection, so labels are typed on the built-in keypad.

Can it print labels from a computer or phone?

No. The PT-70BM is a standalone handheld unit with no USB, Bluetooth or app support. For PC printing you need a higher P-Touch model.

Is it good for cable and file labeling?

Yes for light use. The laminated M-series tape resists smudging and moisture, which suits cables, folders and storage bins.

How does it compare with Brother's desktop P-Touch models?

Desktop models offer a larger keyboard, a bigger display and PC connectivity. The PT-70BM trades those for a smaller, battery-powered body for quick labels.