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| PartNumber | BK-28511-000 | BK-28507-P16 | BK-28507-000 |
| Description | Speakers & Transducers Balanced Armature Speaker | Speakers & Transducers Balanced Armature Speake | Speakers & Transducers Balanced Armature Speake |
| Manufacturer | Knowles | Knowles | Knowles |
| Product Category | Speakers & Transducers | Speakers | Speakers |
| RoHS | Y | - | - |
| Product | Receivers | Receivers | Receivers |
| Impedance | 1.2 kOhms | 13.3 Ohms | 13.3 Ohm |
| Termination Style | Solder Pad | - | Solder Pad |
| Length | 7.87 mm | 7.87 mm | 7.87 mm |
| Width | 5.59 mm | 5.59 mm | 5.59 mm |
| Depth | 4 mm | 4.04 mm | 4.01 mm |
| IP Rating | - | - | - |
| Packaging | Bulk | - | Tray |
| Series | BK | BK | BK |
| Brand | Knowles | - | - |
| Length in | 0.31 in | - | - |
| Length mm | 7.87 mm | - | - |
| Product Type | Speakers & Transducers | - | - |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Audio Devices | - | - |
| Width in | 0.22 in | - | - |
| Width mm | 5.59 mm | - | - |
| Type | - | Balanced Armature | Magnetic, Balanced Armature |
| Dimensions | - | 7.87 mm L x 5.59 mm W | 7.87 mm L x 5.59 mm W |
| Length in | - | 0.31 in | 0.31 in |
| Length mm | - | 7.87 mm | 7.87 mm |
| Width in | - | 0.22 in | 0.22 in |
| Width mm | - | 5.59 mm | 5.59 mm |
| Height | - | - | 4.01mm |
| Frequency | - | - | 6 kHz |
| Termination | - | - | Solder Pads |
| Sound Pressure Level | - | - | 126 dBA |
| Size Dimension | - | - | 7.87mm L x 5.59mm W |
| Frequency Range | - | - | 100Hz ~ 6kHz |
| Shape | - | - | Rectangular |
| Power Rated | - | - | - |
| Power Max | - | - | - |
| PortLocation | - | - | Side |
| Material Cone | - | - | - |
| Material Magnet | - | - | - |