Can the garland be used outdoors?

It is PVC with built-in lighting, so it is best kept under cover. Rain and damp can damage the light wiring. A porch with a roof is fine; open exposure is not.

You can cut the garland, but the lights run through it. Cutting means losing the lit section beyond the cut unless you rewire it. Plan the run before trimming.

Are the lights battery or mains powered?

The listing does not specify. Check the power source before buying, since a mains lead limits where you can hang it and batteries need replacing.

How does it compare with a real pine garland?

Real greenery looks better up close and smells of pine, but it sheds and lasts one season. This one keeps its shape for years and needs no watering, at the cost of a plastic look.

Is 20 m too much for a small room?

For a single mantel or doorway, yes. It suits staircases, long shelves or wrapping several door frames. In a small flat, expect to cut it or double it up.