光电话 meaning in English

photographone; phototelephony
◇光电话机 photophone

Alexander graham bell develops the photophone which uses sunlight to carry messages . it was never commercially produced
亚历山大.格雷厄姆.贝尔利用太阳光开发光电话用于传输信息。这种光电话从未用于商业生产。
While the installed video sensor detects abnormal movement , the system will record the detected field and pops up phonetic alarm and sound and light alarm for the management . in addition , the system sends the messages to the management via mobile phones . the application of the system protects safety of the scientific achievements and standards establishment in the shanghai institute of standardization
鉴于机房的重要性，进出机房要通过指纹验证，而且，当系统检测到消防报警信号后联动门禁系统打开机房门，确保机房人员的安全同时机房内安装有防盗报警探头，当探头检测到有人活动则联动对应的摄像机进行录像，对于重要的报警事件不仅通过声光电话等方式对外报警，还通过手机短信通知相应的管理人员进行系统的维护与管理。