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| PartNumber | PL-21A29WQ | PL-21N30PQ | PL-21A31PQ |
| Description | Audio Indicators & Alerts SLOW PULSE, 3-24VDC 3KHZ, 85DB, 24X14MM | Audio Indicators & Alerts SLOW PULSE, 3-28VDC 3KHZ, 80DB, 24X9.5 | Audio Indicators & Alerts SLOW PULSE, 3-24VDC 3KHZ, 85DB, 24X14MM |
| Manufacturer | Mallory Sonalert | - | - |
| Product Category | Audio Indicators & Alerts | - | - |