Apple is working on technology that will allow for automatic level control in a loud iPod. Development will be able to prevent damage to the hearing when listening to your favorite music at maximum volume.
The device has to calculate how loud and how long someone slushet music, and how you need to turn down the volume to avoid damage to your hearing. The unit will take into account the time of silence - the time during which the iPod has been disconnected.
The volume level is below 70 db is considered safe to iPod can put it on the 100 db. This is equal to, if someone stood up to 3 meters from a pneumatic hammer. Under such conditions, hearing damage may occur within 15 minutes. It is worth mentioning that some devices allow you to listen to music at the level of 120 db.