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| PartNumber | PS-521Q | PS-520 | PS-520Q |
| Description | Audio Indicators & Alerts SLOW PULSE, 5-15VDC 105DB, 45X58X40MM | Audio Indicators & Alerts 1.75X1.58" CONST | Audio Indicators & Alerts CONSTANT, 5-15VDC 105DB, 45X58X40MM |
| Manufacturer | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert Products Inc. |
| Product Category | Audio Indicators & Alerts | Audio Indicators & Alerts | Sirens |
| RoHS | Y | N | - |
| Product | Buzzers | - | - |
| Sound Pressure Level | 105 dBA | 105 dBA | - |
| Tone | Pulse | Continuous | - |
| Voltage Rating | 12 V | 12 V | - |
| Current Rating | 200 mA | 200 mA | - |
| Termination Style | Wire Leads | Wire Leads | - |
| IP Rating | - | - | - |
| Dimensions | 40 mm L x 45 mm W x 58 mm H | - | - |
| Mounting | Flush | Bracket | - |
| Height | 58 mm | - | - |
| Length | 40 mm | - | - |
| Series | PS | PS | PS |
| Width | 45 mm | - | - |
| Brand | Mallory Sonalert | Mallory Sonalert | - |
| Height in | 1.772 in | - | - |
| Height mm | 45 mm | - | - |
| Length in | 1.575 in | - | - |
| Length mm | 40 mm | - | - |
| Product Type | Audio Indicators & Alerts | Audio Indicators & Alerts | - |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Audio Devices | Audio Devices | - |
| Width in | 2.283 in | - | - |
| Width mm | 58 mm | - | - |
| Unit Weight | 2 oz | - | - |
| Frequency | - | 3 kHz | - |
| Color | - | - | Black |
| Termination | - | - | Wire Leads |
| Voltage Rated | - | - | 12VDC |
| Voltage Range | - | - | 5 ~ 15VDC |
| Operating Mode | - | - | Continuous |
| Mounting Type | - | - | Chassis Mount |
| Size Dimension | - | - | 57.5mm L x 44.5mm W x 40mm H |
| Features | - | - | - |
| Ingress Protection | - | - | - |