This is small (10 mm dia, 5 mm high) surplus electret microphone. Data: 100-10.000 Hz, 2-10V DC, -44dB@1kHz, S/N 60 DB, I<650uA @ 6V (2..10V), impedance 1k@1kHz, the small solder island is the signal, the other (larger) is ground.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.Related products:
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