The camera incorporates a pan mechanism and does not require an external unit.

The external camera also requires a subject to make head movements in order to change their gaze.

In addition, a camera or recorder isn't requiring a closed telephony network to work.

"But using the camera would require a person to orient the phone in a certain way," White said, so that approach may not be practical.

Most cameras require the film to be rewound before the camera is opened.

These cameras still require tapes, which may one day deteriorate - but you won't care.

This basic camera requires little work for great pictures.

A digital camera requires a charged battery in order to function properly.

A camera requires law, order, the thin blue line.

For example, cameras not required to be accessible to blind persons.