Carbon Monoxide
A colorless, odorless, and highly toxic gas produced during combustion by furnaces, water heaters, and other home appliances. According to the National Safety Council and the Center for Disease Control, CO kills between 500 and 1000 persons each year in their homes. 5,000 people in the United States are treated in emergency rooms for carbon monoxide poisoning.

CCTV
Closed-Circuit Television. The use of cameras for surveillance. Images may be viewed on a monitor, via the internet, or digitally recorded for later viewing and submission as evidence.

Central Monitoring Station
an agency that receives alarms from subscribers' security systems and requests the dispatch of fire, police, or medical authorities.

Control Panel (system controller)
the "brains" of the security system. Receives transmissions from sensors and communicates data to the central monitoring station.