Alpha A-4220 20 Unit Area of Rescue Master Station/Audio | 123 Security Products

20 Unit Area of Rescue Mas-Aud Requires BB-43 Flush Back Box. Used with #4201B/V or 4201B/VM Call-In Remote Stations.The 4200 Series Is Designed To Accommodate Up To 44 Remote Locations For Each Master Station. The Smallest Master Station Is A 4-Unit And The Capacities Increment In Groups Of 4 To A Maximum Of 44 (Or More With Custom-Sized Masters). Master And Remote Stations Are Made Of Rugged Stainless Steel And Anodized Aluminum. Master Stations Emit A Loud, Clear Tone Signal That Commands An Immediate Response.