The ELK-W040A is a serial ribbon cable that connects the M1XEP to the main serial port on the M1 Control.The 17" long cable is compact enough to keep from interfering with the enclosure door.General InformationName: ELK-W040A CABLE DB9 SERIALCategory: Elk Products Inc., Intrusion & Smart Home, Alarm Control Panels & Keypad, Alarm Control Panel AccessoriesUPC Code: 762158550607Country of origin: China. Country of origin is subject to change.