X10 CM15A Owner's Manual page 5

Hardware Setup
Plug in the CM15A Interface (wait until the installation program
asks you to connect it).
Connect the other end of the USB cable to the CM15A Interface.
8
Plug the Interface into an AC outlet near your PC.
Insert four AAA alkaline batteries in the battery compartment (for
retaining the time of day if there's a power outage).
9
Hardware Setup