x
uploads/visible signal.jpg

visible signal 可見信號。

visible sound

An audible and / or visible signal used to signify the existence of some error or abnormal condition in the system 由音響或顯示設備發出的信號,用以表示系統出現了錯誤或異常情況。

1 high sensitivity . it can transfer visible signal to the indoor areas 1高靈敏度,將可見衛星信號全部轉發到室內區域。

1 high sensitivity . it can transfer visible signal to the indoor 1高靈敏度,將可見衛星信號全部轉發到室內區域。