◎ 來電振鈴時LED燈會閃爍
◎ 含 LED 顯示, LED 亮時表示目前正在保護中。
◎ 若 LED 不亮，則表示避雷器已遭雷擊損壞, 需更換。
(如同 FUSE 般, 此為消耗品)

◎ While incoming a singal, the indicator will be flashing when ringing.
◎ When picking up the hand-set, the on-line indicator will light-on, and this says the connection is perfect.
◎ If the wire is destructed by surge or lightning, the indicator will no longer light-on when ringing or picking up the hand-set.
◎ This means this protection device is damaged.
◎ To Protect the terminal well, please change a new one