Minimize the accidental pick-up of your calls with this two LED line in-use indicator. The tiny, low cost, line-powered, easy-to-build FK318 circuit displays a green signal if the line is clear and a bright red LED to indicate when a line is picked up.

Technical Specification

• Power Supply : Not required.
• PCB Dimensions : 0.77" x 0.81" x 0.6"
• Display : 1 Red LED and 1 Green LED 3 mm.

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