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This review is from: Directed 513T Mini Piezo Siren
Pros: probably good for intended purpose annoying and loud at short range for long duration cheap little
Cons: Not adequate for use as primary siren Not responsive enough with a short pulse Too quite to use as primary siren
Other Thoughts: The purpose of this siren is to blast inside the cab the intruder's ear drums. I assume it should be supplementary to a much louder or lower pitch siren. The high pitch does not carry well, and when used to primarily signal the door lock position, or locate a vehicle, it is inadequate. Sometimes, single honk, it wont even become audible.
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