| Image | Part Number | Manufacturer | Description |
|---|---|---|---|
 | SMT-0927-S-5-R | Projects Unlimited | SMD Magnetic Transducer 3-7V 2.73kHz 80mA |
 | SNP2R | Mallory Sonalert | Panel Mount Piezo 5V 12mA 2.9kHz |
 |
| AT-2830-TWT-R |
| Projects Unlimited |
| Audio Piezo Transducer, 3-28V, 3kHz, 8mA, Thru Hole |
 | SMT-1427-S-2-R | Projects Unlimited | Surface Mount Audio Component, 1.5V, 80mA, 85°C, Lead Free |
 | SC628ANP | Mallory Sonalert | Black 1.687inch Diameter Piezo Speaker, 2.9kHz Frequency, 30mA Supply Current, Panel Mount, -30°C to 65°C |
 | AI-2835-TF-LW150-3-R | Projects Unlimited | Audio Indicators & Alerts 12VDC 10MA 100DBA 3500HZ |
 | SC110J | Mallory Sonalert | Panel Mount Piezo Alarm, Black, 1.69inch Diameter, 30V to 120V, 19mA |
 | PB-0627PE-05AQ | Mallory Sonalert | Speakers & Transducers XDUCR, 4-5VPP 2731HZ, 6.6X3.1MM |
 | ZA120MASP1 | Mallory Sonalert | 120V 40mA Panel Mount Audio Component |
 | POM-2738P-R | Projects Unlimited | 2.7mm Diameter Omnidirectional Microphone, 2.2kR Impedance, 2V Voltage Rating |
 | WST-1612S | Soberton | 12V 40mA 16mm Piezo Buzzer, Through Hole, 2.3kHz |
 | AT-1620-TWT-R | Projects Unlimited | Magnetic Transducer, 4-8V, 2.05kHz, Through Hole |
 | AOM-4540L-R | Projects Unlimited | PROJECTS UNLIMITED AOM-4540L-R MICROPHONE, OMNI LEADS, 9.7MM |
 | ADMP521ACEZ-RL7 | Analog Devices | MEMS Microphone, Omni-Dir, 2CH, Pulse Out, 1.8-3.3V, 65dB SNR, LGA |
 | SMT-0825-S-2-R | Projects Unlimited | Surface Mount Component, 3.6V, 90mA, Lead Free, Square Shape |
 | AI-2304-TT-24V-2-R | Projects Unlimited | 24V DC Input Relay, 30mA, 400Hz, Through Hole Mount, 65°C |
 | POM-3542P-R | Projects Unlimited | Omnidirectional Electret Condenser Microphone, 2V, 2.2kR, PCB Mount |
 | ZA028MDCM1 | Mallory Sonalert | Audio Indicators & Alerts 16 to 28 VDC 3300 +/- 500 Hz |
 | AW-10FR-NSVC | Projects Unlimited | SIREN PIEZO INDICATOR 9-28V CHAS |
 | AT-1220-TT-5-R | Projects Unlimited | Audio Transducer, 1-3V, 2.05kHz, 10mA, Through Hole |
