Viking Electronics C 4000 250 Unit Apartment Entry System Power Adapter Fm Transmitter (88 28844 Fm Transmitter (88 The Surge Unit Will Take The Hit Ensuring Your Booster And More Importantly Provide 4 Door Entry Points & Keyless Entry (or Optional Card Readers) for up to 250 Apartments or Offices RS 232 Port for programming via a PC Remote or local Touch Tone programmable Supports 4 entry points Supports 4 Wiegand type card readers Compatible with Viking’s vandal resistant K 1700 3 K 1900 8 or any Touch Tone phone Non volatile memory (no batteries required) Stores 250 tenant Touch Tone phone numbers and 250 entry codes Programmable tenant’s relay activation code Programmable Master entry code & Maintenance Personnel entry codes Programmable call timer Normally open and normally closed relay contacts for controlling door strikes