Specialists from the United States found that an average person can listen to up to four hours a day and half an MP3 player with headphone button to 70% of its volume, although this level of damage to their hearing. However, this type of equipment can produce hearing damage does listen to its peak for more than five minutes a day with a headset button. As for cell phones, it was discovered that people who talk on cell usually more than one hour a day may experience trouble receiving high-frequency sounds and distinguish phonemes such as "s" or "h". The test-in which 100 regular users and 50 people who do not use cell also showed that using it for more than an hour a day for four years increased the inability to distinguish sounds
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