If you connect a sounder (MP3 player etc.) and play it, for being equipped bond conduction, without disturbing circumstances, can enjoy music appreciation alone.

1. If one wants to listen to music while sleeping, he or she is able to protect his or her hearing as the ear drum is not used.

2. If one wants to study a language in a comfortable condition, it can be useful.

3. A patient who has been hospitalized for a long time can listen to music in a ward without interrupting others.

4. A person in the prime of life who tends to sleep less hours can listen to desired broadcast or music without interrupting others.

5. It helps company workers who have difficulties in falling asleep at night while worrying about economic recession take a rest.

6. Those with a less severe hearing impairment can listen to music while they are lying in bed.