Next Question: 433Mhz type tx/rx?

[TeamTEOR]

WiFi Serial communications could be a solution for you with an Arduino if you are looking to do this with a MP3/WAV soundboard. It would also work if you were just looking for sensor data. If you are controlling other things, it may be a little more diffucult to work with depending on the channels needed. That is where something like the Marcduino, J.E.D.I., or other expansion systems come into play. What is your goal?