| 摘要 |
A cell phone having not only radio frequency (RF) emitter and RF receiver but also having light emitter and light receiver works together with an earphone having not only speaker and microphone but also having light emitter and light receiver. User will talk or listen with the earphone and cell phone will connect the system to the wireless communication network using RF signal. Communication between cell phone and earphone is carried out using light-wave in free space. By using light-wave based earphone to communicate with cell phone; users becomes less exposed to RF radiations.
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