XDMG1S Screwless Data Grid Face Plate in Mocha Finish with Z2GTMB Black Telephone Master Module. This Master Voice is a Full Master Module or PSTN and includes Capacitor/Resistor/Lightening Protector. This module accepts 431/631A Standard BT plugs with Latch on Right Hand Side of Plug. Use with Data Grid Plates. Varilight Data Grid Systems are designed to meet the latest European Safety Legislation. This particular module can fit on single and double Data Grid Plates using 1 of the available 2 or 4 spaces (2 spaces on a single plate, 4 spaces on a double plate). The module simply clips into the Data Grid Faceplate. You can effectively Pic 'N' Mix your modules to suit your requirements for the office or home. The Datagrid modules come in two colours, black or white and these can be used with the Datagrid plates where you can choose from over 20 different colours and styles to match your decor. Face Plate 85mm x 85mm