Viking Electronics C 4000 250 Unit Apartment Entry System Power Adapter Fm Transmitter (88 Switch selectable On Hold Fm Transmitter (88 side of a house Touch Tone toll restriction Allows 911 and 311 outside calls (Programmable) LOG BUS data output for logging entry events 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