Specification AlertType : Motion Only AssemblyInstructions : DIY Brand : Commax BulletPoint1 : Audio intercom set for 4-apartment building. Includes: 4-button lobby unit, 4 interphones DP-SS and 12V power supply BulletPoint2 : Lobby unit: Apartment call and talk to visitor. Interphone: talk to visitor and release door (door strike not included). BulletPoint3 : Use one power source DC12V, 1.5Amp for lobby unit. Lobby unit provides power to handsets. BulletPoint4 : Lobby unit made of aluminum material/flush mounted type; surface-mounted handset BulletPoint5 : Easy to Install: The security module is designed to have a light weight, 14mm width and 27mm length, the simple installation can be quickly completed. Color : Silver CompatibleDevices : [Estimated] Smartphone, Personal Computer, Tablet ConnectivityTechnology : Wired ConnectorType : 4-pin ControlMethod : voice CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier1 : 730957987641 ExternallyAssignedProductIdentifier2 : 0730957987641 ExternallyAssignedProductIdentifier3 : 00662950410003 FinishType : Finish IncludedComponents : 4-button lobby unit, 4 interphones DP-SS, and power supply RF-12015S InstallationType : Flush Mounted,Surface Mount ItemName : Commax 4-Apartment Building Audio Intercom Set ItemPackageDimensions_Height : 7.5946 centimeters ItemPackageDimensions_Length : 0.7112 centimeters ItemPackageDimensions_Width : 5.588 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : home-security-systems Manufacturer : Commax Material : Material ModelNumber : DR-4UM/DP-SS NumberOfItems : 1 PartNumber : DR-4UM/DP-SS/RF-12015S PowerSourceType : Hardwired Electrical Connection with Battery Backup ProductDescription : Audio intercom set of 4-button lobby unit DR-4UM, household handsets DP-SS and 12C 2A power supply for a building of 4 apartments. Packing list: 4-button lobby panel DR-4UM x1, 4-pin connector x2, and manual; handsets DP-SS x4, and 12V 2A power supply x1. Accessories such as electric door strike, power supply for electric door strike and wiring cable are not included. ProductSiteLaunchDate : 2016-12-29T08:00:00.000Z RecommendedUsesForProduct : Home Security SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 4 UnspscCode : 46170000 Voltage : 12 volts