We added this radio to our new 2720. When you remove the cover just above the fridge all the wires necessary are there. I added a small on/off switch, also from Radio Shack so the radio can be turned completely off. It gets rather warm, and the lighted front panel is a little bright at night.
The radio works great! Weather band is especially useful. We have found that the left speaker is not working, still trying to track down the short!