1. Introduction21. IntroductionIntroduction1.1 Model composition*1 Can be configured to be used as an extension monitor.*2 Product names used in this document.Caution:R Before attempting to connect or operate this product, please read the label on the rear of the main monitor.1.2 Accessory information (Supplied accessories)For the sub monitorNote:R Accessories for installing the main monitor and the doorphone are described in the supplied Installation Guide.1.3 General informationR In the event of problems, you should contact your equipment supplier in the first instance.R The available products differ depending on your region. For more information, please consult your dealer.R In this document, the suffix of each model number (e.g., the "BX" in "VL-SW274BX") is omitted unless necessary.When the suffixes are used to describe models (e.g., "BX models"), the suffixes refer to all models in the series.R Design and specifications are subject to change without notice.R The illustrations in the supplied document may vary slightly from the actual product.House mode and Apartment modeThe main monitor can be configured to be used in two modes: House mode and Apartment mode.R House mode refers to when the main monitor is used as a stand-alone system and is not connected to a largersystem comprised of a VL-V900 lobby station. This document describes the operations for House mode.R Apartment mode refers to when the main monitor is used connected to a larger system comprised of a VL-V900lobby station, such as in apartment complexes. Operations for Apartment mode are described in 6. VL-V900basic operations (Page 14) of this document.For further information about features and operations, visit our Web site and find the document:https://panasonic.net/cns/pcc/support/intercom/v900Model compositionMain Monitor Station *1(Main monitor *2)Wireless monitor station(Sub monitor *2)Door Station(Doorphone*2 )VL-SW274 VL-MW274 VL-W617 VL-V522LVL-MW274 VL-MW274 - -AccessoryitemAC adaptor Battery Charger Charger standQuantity 1 1 1 1