Is the Starvis 2 sensor worth it over a standard dash cam?

Yes if you drive at night. The Starvis 2 sensor keeps more detail in low light than the older Starvis sensors in most budget cams, so plates and faces are more likely to be readable.

Does it record in 4K?

No. It tops out at 1080p. That keeps files small and night footage clean, but daytime detail is below what a 4K dash cam captures.

Does it need a phone to work?

No. It records to a memory card on its own, and the touchscreen handles settings. The app is for viewing and downloading clips over Wi-Fi.

Does it log speed and location?

Yes. Built-in GPS stamps speed and coordinates onto the footage, which helps when submitting a clip to insurers or police.

Can I add a rear camera?

The base unit is a single front-facing cam. Check the specific kit before buying if you want rear coverage, since rear cameras are sold as separate bundles.