| Image | Part Number | Manufacturer | Description |
|---|---|---|---|
 | SCH250R | Mallory Sonalert | Audio Indicator Piezo 60VDC/60VAC 250VDC/250VAC 18mA 68dBA 2400Hz to 3400Hz Flange Mount Screw Bulk |
 | POM-2244P-C3310-2-R | Projects Unlimited | Microphones MICROPHONE -44 DB 2 VDC .5 MA 2.2 KOHM |
| FG-23824-G22 |
| Knowles |
| Microphones Omni-Directional Microphone |
| SCH105R | Mallory Sonalert | Audio Indicator Piezo 1VDC 5VDC 16mA 60dBA 2400Hz to 3400Hz Panel Mount Screw Bulk |
| ZA028SDMP1 | Mallory Sonalert | AUDIO PIEZO IND 16-28V PNL MNT |
 | FB-EM-30349-000 | Knowles | Microphones 20M OMNI, 167MM LONG 60MM WIRE, 5.4 DIA |
| SMT-0927-T-2-R | Projects Unlimited | AUDIO MAGNETIC XDCR 2-4V SMD |
| PKM34EWH1201C | Murata | Audio Ringer Piezo 60Vp-p 30Vp-p 70dB Flange Mount Wire Lead Bulk |
 | TOM-1045S-C33 | Projects Unlimited | Microphones 2.2kOhm x 4mm |
| PT-2060PQ | Mallory Sonalert | AUDIO PIEZO TRANSDUCER 1-30V TH |
 | SMT-0827-TW-3V-R | Projects Unlimited | Speakers & Transducers SMD TRANSDUCER 3.6VP-P 70MA |
 | AB2734B | Projects Unlimited | BUZZER ELEMENT STD 3.4KHZ 27MM |
 | POM-2746L | Projects Unlimited | Microphones 2.2kOhm x 6mm |
| AOM-4542P | Projects Unlimited | Microphones 2.2kOhm x 9.7mm |
 | AT-12 | Projects Unlimited | Speakers & Transducers PZ 85dB 5500Hz 15Vpp |
 | SMT-1341-T-2-R | Projects Unlimited | SMD Piezo Transducer, 4.1kHz, 5V, 13mm, 2.5mm H, Tape & Reel |
 | SC628D-1 | Mallory Sonalert | Audio Indicators & Alerts 6-28VDC Continuous Panel 1900Hz 80dB |
| STA20502 | Mallory Sonalert | ALARMS, BACK UP ALARMS, SOUND FREQ. 1250(HZ), 12 TO 24 VDC |
| SC648A | Mallory Sonalert | Audio Indicator Piezo 10VDC/10VAC 48VDC/48VAC 16mA 68dBA 2400Hz to 3400Hz Panel Mount Screw Bulk |
 | SC648AHR | Mallory Sonalert | Audio Indicators & Alerts CONSTANT, 10-48VAC 4500HZ, MEDIUM |
