There are many situations in which using ear phones in both ears is unsafe

mirethmusic
Another unique feature is the mono mixdown feature. There are many situations in which using ear phones in both ears is inconvenient or unsafe, such as when grocery shopping, when walking at night, or when minding children. In these situations, listening with only one earphone in would be preferable, but can hinder the listening experience because stereo sound depends on both the right and left track being heard together. Unlike stereo, Mono mixdown burns all the music to both the right and left track, so one ear listening still hears both tracks. [Read More]