Wheelock’s Newest Horn Strobe and Horn Appliances are the Series NS Horn Strobe appliances and the Series NH Horn. Both the Series NS and NH are of LOW CURRENT design with ZERO INRUSH. The horn appliances provide a Selectable continuous horn tone or temporal pattern (Code 3) tone when constant voltage from a Fire Alarm Control Panel (FACP) is applied. Each tone has two dbasettings to choose from. All models (horn only or horn with strobe) may be Synchronized when used in conjunction with the Series SM or DSM Sync Module(s).Additionally, the horn may be silenced while maintaining strobe activation of the Series NS Horn Strobe appliances.All of these features are achievable with either Wheelock’s Patented 2 Wire Series NS or with the 4 wire Series NS4.