Check the listing for details. Viking electronics C-1000B Door Control W-1000/2000a/3000. Condition: New. Listed at 230.74 USD. Viking door entry/ CCTV controller Allows single line phones or phone systems to share a phone line with one or two Viking doorboxes or paging amplifiers Provides two Touch Tone controlled relays to operate door strikes or gate openers and provides doorbox triggered CCTV camera switching Switch between two CCTV cameras when either doorbox is activated Handy as a line concentrator - one fax machine or answering machine can answer 3 lines Doorbox triggered CCTV switching Custom ringing mode allows you to distinguish doorbox calls from CO calls Compatible with up to two of the following: W-1000, W-2000A, or W-3000 Calls can be placed on hold when visitors call from the doorbox or when paging Call waiting tones indicate which doorbox is calling and distinguish a doorbox call from a CO line call Provides two Touch Tone controlled NO or NC dry contact closures (5 amp rating) for door strikes or gate openers Keyless entry/postal lock input Built-in talk battery for "no CO line" applications Auxiliary contact output for doorbells, lights, etc. VKC1000B