Daryl,

You are correct. The product is a transceiver. By the way, the 4040 product number cited here is a retailers number for the product. It the actual manufacturers product number is IR543.

The other transceiver mentioned in this thread with the antenna is used to receive X-10 RF signals and send X-10 signals over the AC powerline. It cannot be accessed by the Pronto because it doesn't receive IR signals. However, if you purchase X-10 RF wireless controllers you would need this transceiver. The advantage of using RF is that you do not have to be in the same room to control your lighting.

Robert
RCI Automation
[email protected]
[Link: ourworld.compuserve.com]