I would like X-10 to show a comparable table or chart of specifications of comparable items. I am trying to figure out what the difference is between the different motion sensors. From what I learned from the X-10 website, they all do the same thing but have different costs. I know that certain motion sensors from alarm companies will not trigger if an item is under 80 pounds do any X-10 sensors operate the same. Besides the X-10 Pro modules which provide 2-way comunication, their are several modules provided by X-10 which do the same thing and vary in price. When shopping for a module, I am looking for an item that does what I need it to do, When two modules perform in the same manner and have different prices with no explanation to the difference, I will purchase the cheaper. I have noticed that some of the more costly units include a 2 year warranty instead of the standard 1 year. Just provide me with a chart so I can determine which Item will do what I need it to do.