For more information videos and installation guides on the dsc alexor alarm system click herefor the alexor brand store the dsc alexor wireless pet immune pir movement detector will protect a whole room hallway or landing area to a maximum of 50 x 60 feet by placing this item in key areas of your home you can ensure that a wide area is protected with just one sensor to avoid false alarms the sensor will automatically adjust to changes in the climate around it and you can also select how s