The CM12U interfaces your computer with your X10 devices. This allows you to control devices with your PC, run complex macros and generally take your home automation to the 'next level' functionally.
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CM11U with a USB cable included, allowing you to run the CM11U computer module on systems that do not have a serial port on them.
The Marmitek CM15 Pro computer interface and transceiver offers the user improved control of their X10 modules along with Marmiteks's ActiveHomePro software