This unit prevents eavesdropping or dialling across calls where two telephone devices (handset, answering machine, modem, etc) are fitted to the same extension outlet.
The unit operates on a 'first come first served' basis. When one of the telephone devices is in use, the unit blocks interference and eavesdropping from the other. Two LEDs indicate if one of the lines is currently in use or not.
You'll get what you see in the pic.
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