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 LED if the line is clear and a bright red LED to indicate when the line has been picked up.
Power Supply: Not required
PCB Dimensions: 19.6 mm X 20.6 mm X 15.2 mm (0.77 X 0.81 X 0.6 in.)
Recommended Housing: FB11