For example, you may keep the window sensors always activated but deactivate the door sensors when you’re at home. These sensors can function as part of your security system or on their own, and they vary in size and design from tiny, sleek sensors to bulky and obvious. Sensors also vary in sensitivity. Some may trigger when the door or window vibrates versus actually opening. A carbon monoxide detector triggers when the level of carbon monoxide in your home reaches a dangerous level. Unlike other environmental dangers, you cannot see, taste, or smell carbon monoxide. These detectors can save your life and those of your pets. Carbon monoxide is released when you burn gasoline, wood, oil, charcoal, propane, and natural gas, so homes with gas appliances, chimneys, wood burning stoves, and connected garages have a higher need for carbon monoxide detectors. Like smoke and fire alarms, these sensors can work as stand alone alarms or connect with your security system. It’s always a great idea to connect detectors to your system so that a monitoring center can notify you and emergency dispatch in case the alarm is triggered. Some wireless home security systems offer a video recording storage option and others don’t.