New Honeywell 3" Piezoelectric Speakers, Piezo Microphone? Transducers? PT-40B

Description

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New Honeywell 3″ Piezoelectric Speakers, Tweeters, Intercom Microphone? Transducers? Part Number PT-40B or 5-760-004-00 .  Each bid quantity is for One (1) Speaker.  You may bid / buy any number, up to the total quantity available above.
These were purchased at an electronics wholesale company liquidation earlier this year, and they were brand new in the original factory cases.  They were produced for Honeywell, and they appear to be very well made.  We took one apart (see pictures #8 & #9) and found a Piezo element inside, which explains why we had so much trouble finding the ohms with a multimeter.  We applied several different DC voltages, and they are obviously a speaker rather than simply a Piezo buzzer.  Some Piezos function as both speaker and microphone, but we do not have the expertise to determine if these are or not.  If we obtain any further information, we will update the listing accordingly.
According to the calipers
:
Overall length:  3.780″ / 96.02 MM
Width:  2.962″ / 75.24 MM
Thickness:  .723″ / 18.37 MM
Terminals:  .205″ / 5.21 MM
Mounting holes:  1.17″ / 4.48 MM Diameter, Spaced 2.407″ x 2.407″ (61.15 MM x 61.15 MM) OC (on centers)