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| PartNumber | BK-21612-B48 | BK-21612-000 | BK-21610-000 |
| Description | Speakers & Transducers Balanced Armature Speaker | Speakers & Transducers Balanced Armature Speaker | Speakers & Transducers Balanced Armature Speake |
| Manufacturer | Knowles | Knowles | - |
| Product Category | Speakers & Transducers | Speakers & Transducers | - |
| RoHS | Y | Y | - |
| Product | Receivers | Receivers | - |
| IP Rating | - | - | - |
| Series | BK | BK | - |
| Brand | Knowles | Knowles | - |
| Product Type | Speakers & Transducers | Speakers & Transducers | - |
| Factory Pack Quantity | 25 | 25 | - |
| Subcategory | Audio Devices | Audio Devices | - |
| Type | - | Balanced Armature | - |
| Frequency | - | 3.8 kHz | - |
| Sound Pressure Level | - | 123 dBA | - |
| Impedance | - | 2.36 kOhms | - |
| Shape | - | Rectangular | - |
| Termination Style | - | Solder Pad | - |
| Length | - | 7.87 mm | - |
| Width | - | 5.59 mm | - |
| Depth | - | 4 mm | - |
| Packaging | - | Bulk | - |
| Length in | - | 0.31 in | - |
| Length mm | - | 7.87 mm | - |
| Width in | - | 0.22 in | - |
| Width mm | - | 5.59 mm | - |