The Outdoor Siren OSX is a wireless and battery-powered siren designed for use with a Videofied security system. The unit transmits a check-in signal every eight minutes that includes its unique identification code, along with the tamper condition and battery status. The siren is normally installed outside of the building to warn the surroundings that an intrusion is occurring. The unit is powered by three alkaline batteries that can last four years, depending on the amount of siren/flashlight activity.