I recently downloaded Sound Oasis two files, one for Pink Noise and the other for Tinnitus. They each have an 8 hour, uninterrupted, playing-time and can be downloaded onto a MP3 Player. Once there, I can either use my earbuds or my Ipod dock to hear the downloads.
I have been searching for such sound for months. Most “white noise” products have a loop every five, twenty or eighty minutes. The result is that just as I am drifting off, the sound turns off and startles me back awake. Alternatively, I was sometimes awoken from a deep sleep when the sound “re-looped.”