"Plug n' Power" was Radio Shack's name for X10. All their modules were made in the same factory in PRC as X10's modules and worked exactly the same. Radio Shack dropped the entire "Plug n' Power" line last year or so, as, guess what, the line didn't sell a lot. Oddly enough, Radio Shack never carried interfaces like the CP290 or the CM11A ever, just the modules and some oddball security items that also weren't not sellers either. Radio Shack was a good place to pick up modules quickly.