| PartNumber | PK-21N30PQ | PK-21A31PQ | PK-21A29PQ |
| Description | Audio Indicators & Alerts CONSTANT, 1.5-30VDC 3KHZ, 80DB, 24X9.5MM | Audio Indicators & Alerts CONSTANT, 3-24VDC 3KHZ, 85DB, 24X14MM | Audio Indicators & Alerts CONSTANT, 3-24VDC 3KHZ, 85DB, 24X14 |
| Manufacturer | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert |
| Product Category | Audio Indicators & Alerts | Audio Indicators & Alerts | Audio Indicators & Alerts |
| RoHS | Y | Y | Y |
| Product | Buzzers | Buzzers | Buzzers |
| Sound Pressure Level | 80 dBA | 85 dBA | 85 dBA |
| Tone | Continuous | Continuous | Continuous |
| Frequency | 3 kHz | 3 kHz | 3 kHz |
| Voltage Rating | 12 V | 12 V | 12 V |
| Current Rating | 12 mA | 18 mA | 18 mA |
| Termination Style | Solder Pin | Solder Pin | Solder Pin |
| IP Rating | - | - | - |
| Diameter | 24 mm | 24 mm | 24 mm |
| Dimensions | 24 mm L x 24 mm W x 9.5 mm H | 24 mm L x 24 mm W x 14 mm H | 24 mm L x 24 mm W x 14 mm H |
| Mounting | Flush | Flush | Through Hole |
| Height | 9.5 mm | 14 mm | 14 mm |
| Length | 24 mm | 24 mm | 24 mm |
| Series | PK | PK | PK |
| Width | 24 mm | 24 mm | 24 mm |
| Brand | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert |
| Height in | 0.374 in | 0.551 in | 0.531 in |
| Height mm | 9.5 mm | 14 mm | 13.5 mm |
| Product Type | Audio Indicators & Alerts | Audio Indicators & Alerts | Audio Indicators & Alerts |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Audio Devices | Audio Devices | Audio Devices |
| Unit Weight | 0.091712 oz | 0.162260 oz | 0.098767 oz |
| Packaging | - | Bulk | - |