Carbon Monoxide (CO) is a tasteless, invisible but very poisonous gas created among others by incomplete burning of burnable material or gas. This device is measuring the CO concentration in the air and issues an alarm when a certain level of CO is exceeded. The device will send alarm when one of the following conditions are met: 50 ppm for 60 minutes 100 ppm for 10 minute 300 ppm for 3 minutésAdditionally a remote device can be switched. This can be an actuator e.g. opening a door or another alarm device such a siren. The device consists of a mounting base that is screwed to the wall and the actual device is mounted to this base. It is recommend placing the CO sensor on the sealing because CO is lighter than air and will always move upwards. The device is battery-operated and therefore in sleeping mode unless an action is detected. After a programmable sleeping time the device wakes up and sends a status information. After this the unit goes back to sleeping modus. Batteries can be changed without unscrewing the mounting base. The unit has tree colored LED to give visual warning when the battery is low or an CO alarm occurred.