The Federal ruling set off a race among suppliers for a passive system, requiring no action on the part of the driver.

Images on the screen are brighter and sharper than they would be in a passive system.

The cost is much less if a passive system was installed during construction.

There are many kinds of motion sensors, from active to passive systems.

But it is in essence a passive system, a means of escape from danger.

Additionally, these systems include all the benefits of a passive system.

This "passive system" is not dependent on the effort of the patient.

Active systems will always be more expensive than a passive system.

Type 801 provide azimuth of targets and it is a passive system.

The other type of alarm system is called a passive system.