The form factor of a dash cam refers to the physical shape and size of the camera. Dash cams are typically designed to be small and compact so that they can be easily mounted on a vehicle's dashboard or windshield without obstructing the driver's view. The most common form factor of a dash cam is a small rectangular box, with dimensions typically ranging from 2 to 4 inches in width and 1 to 2 inches in height.

Most dash cams also have a built-in screen or display, which allows the user to view the footage that the camera has captured. The size of the screen can vary depending on the model of the dash cam, but it is usually between 1.5 and 3 inches in size.

The form factor of a dash cam is an important consideration when choosing a camera, as it determines how easy it is to mount and position the camera, as well as how visible the camera is when mounted on the dashboard or windshield. It's important to choose a dash cam that is small and unobtrusive, while still providing clear and high-quality footage of the road ahead.

In the context of a dash cam, "form factor" refers to the physical design and size of the device. It includes the shape, dimensions, and mounting options that affect how the dash cam can be installed in a vehicle and how it looks when installed.

Dash cams come in various form factors, including:

1. Windshield mount: This is the most common form factor for dash cams. These cameras mount to the windshield of a vehicle using a suction cup or adhesive mount.
2. Rearview mirror mount: Some dash cams are designed to be mounted on the rearview mirror of a vehicle. This design allows the dash cam to blend in with the vehicle's interior.
3. Compact: These dash cams are small and easy to conceal, making them a good option for those who want to avoid drawing attention to the device.
4. Dual channel: These dash cams have two cameras - one for the front and one for the back of the vehicle. They are designed to capture footage from both directions simultaneously.

The form factor of a dash cam is an important consideration when choosing a camera, as it affects how the device can be installed and how noticeable it will be in the vehicle.

It's important for a dash cam to have a discreet form factor for several reasons:

1. Legal compliance: In some jurisdictions, it is illegal to have a device mounted on the windshield that obstructs the driver's view. A discreet form factor can help ensure that the dash cam does not obstruct the driver's view and is compliant with the law.
2. Theft prevention: A dash cam that is highly visible may attract unwanted attention and make it more likely to be stolen. A discreet form factor can help deter thieves and keep the dash cam out of sight.
3. Driver distraction: A dash cam with a large or bulky design may be distracting to the driver, especially if it blocks the view of the road. A discreet form factor can help ensure that the dash cam is not a distraction while driving.
4. Aesthetics: A dash cam with a discreet form factor can blend in with the vehicle's interior and not detract from its overall appearance.

Overall, a discreet form factor can help ensure that the dash cam is legal, secure, and not a distraction while driving, while also maintaining the vehicle's aesthetics.

Ultimately, the best form factor for you will depend on your personal preferences and needs. If you want a discreet option, a rearview mirror or compact dash cam might be best. If you want a more comprehensive view of your surroundings, a dual-camera dash cam might be the way to go.