SIMPLETECH IMAC533512 512MB RAM for iMac G5 Select one of 5 built-in sounds and/or connect a CD or MP3 player to the eye mask. Lose yourself in the sounds of nature undisturbed by light and distracting external noises. Great for relaxing on airplanes or napping in unfamiliar places, this eye mask creates a peaceful haven for travelers--or harried parents at home. Soft, thick and cushy, the foam mask fits comfortably around any size head by means of an adjustable strap with hook-and-loop closure. Uses 2 AAA batteries (not included) Includes AC adapter (for better, untethered relaxation, we suggest using batteries)