1996 - Volume #20, Issue #2, Page #33
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Bird Feeder Transmits Sound Indoors
A wireless microphone under the roof of a new bird feeder transmits bird sounds to a speaker unit inside the house.
The "WingSong" microphone is tuned to the sound frequency of bird calls and songs. The weatherproof transmitter operates on four "C" cell batteries. It automatically shuts off at night and comes on..........


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1996 - Volume #20, Issue #2