It is always risky buying a semi-expensive product on-line, because if you have to return it, it is a lot of work/hassle for the amount of money you get back.  DO NOT BUY THIS ITEM!  SPARE YOURSELF THE AGGRAVATION!  FIrst of all, I didn't even get what I ordered.  I ordered (and payed for) the more expensive Caller-ID compatible RC930 wireless jack, but they sent me the cheaper, non-caller ID compatible one.  I decided to go ahead and use it and after carefully following the directions and the troublshooting guide IT DIDN'T WORK.  Then after calling tech support and CAREFULLY following the automated trouble shooting directions it still didn't work.  So then I called back again and waded thru the automated directions again so I could finally be connected to a live technician, ONLY TO GET A BUSY SIGNAL.  So now I have to go thru the hassle of returning this product to get my $53.79 back, and I still don't have a phone jack where I wanted one.  Looks like hardwiring a new phone line will be easier.