Just in case someone else experiences the difficulty I had I am writing this response to my above comments. Today I received an email from X10 support informing me to try a different code. This code if different from the one printed on pg. 38 of the manual. Luckily I still had the remote and hadn't returned it yet so I opened it back up and tried the code 0998. The device responded perfectly and it worked great. Unfortunately, I have already bought the harmony 880 and am still planning on returning the X10, or perhaps I can get a friend to buy it from me. I'll try that option before immediately returning the remote. The thing I'm not liking when comparing it to the other remote is that there is not an icon for light. You have to use a TV, audio, DVD icon and cannot customize or even change the wording from TV to lights. Regardless, it does work and I would have kept this remote had I not already purchased the other.