Check the listing for details. DMC3-4 Radio-Intercom New M&S Master Nortek Linear. Condition: New. Listed at 950.00 USD. DMC3-4 White Radio Intercom Master Includes M&S main station New 2020 DMC3-4 master - never installed Replaces most older intercom systems Uses minimum of 3 or 4 wires. Modern upgrade for MC602 DMC3-4 is also the current retrofit for MC302, MC350A and others "3-4" means DMC3-4 works on 3 or 4 wire systems Works perfectly on a minimum of 3 wires Includes Trim-out Instructions and Owner's Manual Includes written M&S Systems 2-year warranty Features: Replacement System for MC602 and Nutone 3, 4, and 6 wire systems 30 watts will handle 15 intercom stations and 3 door stations AM/FM radio with 16 presets Inputs for 2 other music sources Talk and listen to any room station in the house Or select 'Monitor' and be heard through the entire house Optional Door chimes can be added to sound at all stations if needed Radio has auto on/off feature Built-in Gate Release Option Ships Lower US Combine items for lower shipping when paid together