The 4000 series range of "True" 2-wire color videokits with codelock (ESVKC series), are available with 1 or 2 buttons and as surface or flush color videokits. The flexible design allows for up to a total of 4 videophones per call button with the facility for intercommunication between the videophones in the same apartment or intercommunication between videophones in different apartments. Each videokit is available with a choice of 5 different videophone options from the 6286 videophone or the 6388, 6488 and 6788 or 6788BL series hands-free monitors. Installations couldn't be easier thanks to the common 2-wire BUS system (VX2300) using two non-polarity twisted pair wires (the system does not require coaxial cable). The videokits are ideal for small-scale "1-to-1" installations or low-rise apartment blocks (up to a total of 12 apartments max. with the inclusion of additional 4000 series button expansion modules), but can also be expanded up to a maximum of 8 entrances where additional 2301N multiple entrance switchers are required. Other key features of the videokit include; adjustable call tone, conversation time and microphone and speaker volume adjustments, selectable camera recall including external camera input. The combined speaker and camera module (4384-1 or 4384-2) entry panel has a built-in color camera with white illumination LED's that provides the best quality picture in any lighting condition. It also has a lock release relay (C, NO and NC) with selectable capacitor discharge, push to exit input, call progress reassurance tones and DDA compliant call progress LED's; BUSY, CALL, SPEAK and DOOR OPEN. The ESVKC videokits also incorporate a 4901 codelock module which has 3 programmable access codes, 3 relay contact outputs (C, NO and NC) with push to exit inputs for relays 1 and 2 only. The relays can be programmed from 1-99 seconds or programmed with 00 for latching output.