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| PartNumber | PFD-21A29WQ | PFD-20A35EWQ | PFD-21N30PQ |
| Description | Audio Indicators & Alerts CONSTANT/FAST PULSE 3-24VDC, 85DB, 24X14 | Audio Indicators & Alerts CONSTANT/FAST PULSE 3-24VDC, 95DB, 28X25 | Audio Indicators & Alerts CONSTANT/FAST PULSE 3-28VDC, 80DB, 24X10 |
| Manufacturer | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert Products Inc. |
| Product Category | Audio Indicators & Alerts | Audio Indicators & Alerts | Buzzers |
| RoHS | Y | Y | - |
| Product | Buzzers | Buzzers | - |
| Sound Pressure Level | 85 dBA | 95 dBA | 80dB @ 12V, 30cm |
| Tone | Continuous | Continuous | - |
| Voltage Rating | 12 V | 12 V | - |
| Current Rating | 18 mA | 10 mA | - |
| Termination Style | Wire Leads | Wire Leads | - |
| IP Rating | - | - | - |
| Diameter | 24 mm | 28 mm | - |
| Dimensions | 24 mm L x 24 mm W x 13.5 mm H | 28 mm L x 28 mm W x 25 mm H | - |
| Mounting | Flush | Flange | - |
| Height | 13.5 mm | 25 mm | - |
| Length | 24 mm | 28 mm | - |
| Series | PFD | PFD | PFD |
| Width | 24 mm | 28 mm | - |
| Brand | Mallory Sonalert | Mallory Sonalert | - |
| Height in | 0.551 in | 0.984 in | - |
| Height mm | 14 mm | 25 mm | - |
| Product Type | Audio Indicators & Alerts | Audio Indicators & Alerts | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Audio Devices | Audio Devices | - |
| Unit Weight | 0.126986 oz | 0.345685 oz | - |
| Frequency | - | 3.5 kHz | 3kHz |
| Packaging | - | - | Bulk |
| Termination | - | - | PC Pins |
| Driver Circuitry | - | - | Indicator, Internally Driven |
| Technology | - | - | Piezo |
| Input Type | - | - | DC |
| Voltage Rated | - | - | 12VDC |
| Voltage Range | - | - | 3 ~ 30V |
| Operating Mode | - | - | Continuous, Fast Pulse |
| Current Supply | - | - | 12mA |
| Operating Temperature | - | - | -20°C ~ 70°C |
| Washable | - | - | No |
| Port Location | - | - | Top |
| Mounting Type | - | - | Through Hole |
| Size Dimension | - | - | 24.0mm Dia x 9.7mm H |