Special Features:

Specifications: headset speaker: 27mm dynamic driver; microphone: -67dbv/microbar: -47dbv/pascal +/- 4db; mic power voltage: 1.5v to 10v; impedance: headset: 32ohm; microphone: 2.2k ohms; frequency response: headset 20-20, 000 h; microphone 100-16, 000 hz

Properties:

An item consisting of one or two earphones with a connecting cord and with or without a headband. Single headphone type must include facilities as required for use. For items without earphones designed to protect the ears from noise, see protector, hearing.