Specification Brand : RDM Intercoms BulletPoint1 : Expandable up to 24 stations BulletPoint2 : RDM provides clear, dependable, and functional wired intercoms BulletPoint3 : All RDM Intercoms are proudly manufactured in the USA. BulletPoint4 : RDM Intercoms come with a One Year Warranty BulletPoint5 : Allows complete control over the right intercom for your store. ExternallyAssignedProductIdentifier1 : 0746507537785 ExternallyAssignedProductIdentifier2 : 746507537785 FrequencyRange : 2400 MHz IncludedComponents : 1 x PBX, 2 x IP Phones, 1 x Power Supply ItemName : RDM Performance Series I/O Card with 4 Stations ItemPackageQuantity : 1 ItemTypeKeyword : commercial-access-door-intercoms Manufacturer : RDM Intercoms ModelNumber : D20 NumberOfChannels : 1 NumberOfItems : 1 PartNumber : 78-8117-3900-8 ProductDescription : RDM Performance Series I/O Card With 4 Stations. These expandable cards allow you to create the right intercom for your store. ProductSiteLaunchDate : 2019-08-12T07:00:00.000Z SpecificUsesForProduct : Commercial and Industrial Settings UnspscCode : 40000000 WaterResistanceLevel : water_resistant