A fire safety officer looks at the camera and speaks.

Moving image of a smoke alarm on a ceiling.

Moving image of a staircase.

A hand holds a smoke alarm in front of the camera.

A finger presses the button on a smoke alarm which then beeps.

A fire safety officer on a step ladder places a smoke alarm on a ceiling.

A still image of a smoke alarm in a box.

Moving images of smoke alarms on a ceiling.

The video ends.