Sharper Image SI513 - Manual (Page 5)

The monitor must be set to the same channel as the camera to
receive the camera signal. If more than one camera is used, set
each camera to a different channel. Select the matching channel
on the monitor to switch between desired cameras.
Use the monitor jacks to display the picture and sound on your
own TV/monitor instead of the built-in monitor, or to record
through a VCR. (A cable is included to connect the LCD monitor
to the audio/video jacks on most TV or VCR systems.)
To reduce battery consumption, or if a video display is not
required, set the monitor power switch to AUDIO ONLY.
Controls and Operation
Adjustable
Antennas
Channel
Switch
Removable Base
Channel
Switch
Power
Switch
Video Out
Jack
Power
Switch
Volume and
Picture Adjustment