| 摘要 |
An accessory for remote speaking and/or listening to a mobile telephone comprises a unit having means for connection to an associated mobile telephone of a microphone and/or earpiece or headset on a dispensable lead electrically connected to the connection means and adapted to be housed within the unit. A spool fitted with spring means is contained within the unit which has the lead wound on its outer surface. When the microphone and/or earpiece or headset is withdrawn from the unit for use the spring is tensioned through rotation of the spool. The microphone and/or earpiece or headset is rewound by the spring means by operation of a catch which releases the stored tension. The dispensable lead is preferably wound on the circumference of the spool when not in use and a ratchet or similar device is fitted to the spool which prevents rotation in the opposite sense to the spool rotation created by withdrawing the audio unit lead, operation of the catch disables the ratchet or similar device when the audio unit ceases to be used and the audio lead is rewound. The dispensable lead is connected to the main body of the telephone by supplementary contacts on the main unit which mate with contacts on the telephone body which may contain a rechargeable battery. Alternatively the unit can replace the detachable back of a mobile telephone which covers the battery. The unit can take the form of a pendant or a thin card-shaped pack with a short supplementary lead to connect it to the associated mobile telephone.
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