Viking simple emergency phone without auto dialing Door or gate communication Commercial, industrial and residential door security Truck stop/gas station fuel island communication Business delivery entrances Use in conjunction with a Viking Hot-Line Dialer on C.O. lines or analog PABX/KSU stations Use on any programmed ringdown circuit of an analog PABX/KSU station One year manufacturer's warranty Handsfree or handset available Phone line powered No dial pads Designed to mount in a standard emergency phone enclosure Built for easy installation and simple operation Auto answer feature allows remote monitoring (can be disabled) Adjustable time out to limit prank calls and false alarms (approximately 30 seconds 7 minutes) Auto-answer feature allows remote monitoring (can be disabled)VKK1500EHFA