| 摘要 |
A cordless hands free device for use with a mobile phone comprises a first unit which is worn by the user and a second unit which connects to an electrical connection on the phone. The first unit includes a microphone and a speaker or earphone. The second unit includes a radio frequency transmitter and receiver which provide a two way low power (eg 3 watt) communication link over short distances (eg 1 metre) with the second unit. The transmission between first and second units may be encrypted. Both first and second units may incorporate a rechargeable battery. |
