These X10 modules are no longer needed and would be ideal for someone who wants to retrofit some Home Automation into their house or home theatre. Especially if you are renting as it all plugs in.

There is:
4 appliance modules (one with serial computer interface, one with RF interface

2 plug in dimming light modules

2 bayonet fitting light modules

2 RF based PIRs

Wall mount RF buttons

A remote control.

A considerable amount if X10 Opensource software exists to enable computer control of these. I used to run these via a small linux system.