| http://www.w3.org/ns/prov#value | - Thus, if there is any danger, there is a problem that safety is degraded. [0048] Furthermore, in the case where the both-ear mount type earphone 17 has been mounted to the telephone set main body unit 11, the gain of the amplifier 14 is controlled to be fed back according to an analog audio signal delivered to the earphone 17.
|
