We also preferred models with buttons we could identify in the dark, as well as intuitive menus and a functional companion app. Easy-to-use controls: We looked for models with clearly labeled, easily reachable controls (especially the video-lock button).Sufficient field of view: We required each model to have a field of view (FOV) in the range of 140 to 160 degrees-wide enough to take in a multi-lane highway or a large intersection without creating a wide-angle effect that makes cars in front look farther away and details harder to see.To draw power when the car isn’t running, a dash cam usually needs to be hardwired to the car’s fuse box, connected to an external battery, or plugged into the vehicle’s OBD-II diagnostic port. 24-hour parked-car monitoring: We required each model to be capable of recording impacts or movement around your car, any time of day or night, whether you’re in it or not.Night vision: We made night vision a requirement for a dash cam to be considered for testing since car crashes and other incidents you may want to document can occur at any time of day or night (as well as in dark environments such as highway tunnels).We preferred models with 2160p (4K/UHD) or higher resolution, since their footage is often notably sharper than that of 1080p models, and we didn’t consider anything under 1080p.
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