Using headphones at a high volume level can cause temporary or permanent hearing impairment or deafness due to an effect called masking. The headphone volume has to compete with the background noise, especially in excessively loud places such as subway stations, airplanes, and large crowds. This leads to the disappearance of the normal pain associated with higher levels of volumes, and extended periods of the excessively loud volume is extremely damaging.
Other risks arise from the reduced awareness of external sounds is some jurisdictions regulate the use of headphones while driving vehicles, usually limiting the use of earphones to a single ear. It to ensure that drivers keep their hands on the vehicles controls.
In addition, it also will be benefits to us. It can have an ergonomic benefit over the traditional handset at office desks. They save space and many new models are wireless. They also allow call center agents to maintain good posture instead of tilting their head sideways to cradle a handset.
(Source: http://en.wikipedia.org/wiki/Headphone)
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