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.
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