"It's a $14 webcam that works. Do not mistake it for a good one."
The webcam's 'Adjustable FOV' is not an optical feature. It is a digital crop, which means zooming in will simply magnify a smaller portion of the 1080p sensor, significantly reducing effective resolution and image quality.
This is a disposable-tier product for someone who needs a functional camera immediately for a single, non-critical call. It is also suitable for a child's computer or as a temporary backup if a primary laptop camera fails.
Anyone who uses a webcam for professional work, streaming, or regular family calls should skip this. The image and sound quality will undermine your presentation. A used name-brand webcam will offer vastly superior performance.