Provide 4 Door Entry Points & Keyless Entry (or Optional Card Readers) for up to 250 Apartments or OfficesRS-232 Port for programming via a PCRemote or local Touch Tone programmableSupports 4 entry pointsSupports 4 Wiegand type card readersCompatible with Vikings vandal resistant K-1700-3 K-1900-8 or any Touch Tone phoneNon-volatile memory (no batteries required)Stores 250 tenant Touch Tone phone numbers and 250 entry codesProgrammable tenants relay activation codeProgrammable Master entry code & Maintenan