US Patent 7120267 Headset

A headset of the present invention includes: a housing 10 worn on one auricle of a wearer; an arm 41 having a predetermined length, one end side of which is accommodated in the housing and the other end side of which is pulled out of a hole 13a of the housing to the outside, accommodated in the housing by adjusting the length pulled out of the hole 13a of the housing to the outside; and a microphone attached to the arm 41. When the headset is being used, the end of the arm 41 comes close to the wearer's mouth by pulling the arm 41 out of the housing 10. When the microphone need not be used, the arm 41 is stored in the housing 10 so as not to protrude from the housing 10.