These boards are sold as used units, we do not know what their original intended use was.
They are coated in a thin layer of some sort of waterproofing material so they may have outdoor use possibilities.
Each unit has a small mounting hole in the center, contains a 555 timer chip, two other ICs, some resistors, capacitors and a transistor.
Board is guaranteed to be in good working condition -the power and speaker leads are too short and will need to be re-soldered when installed in your project.
Includes hook-up diagram. Perfect for the experimentor, Click here to download an audio file of the siren's noise
Only $2.99 each
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