| PartNumber | FK-23989-000 | FK-23451-000 | FK-23466-000 |
| Description | Speakers & Transducers Balanced Armature Speaker | Speakers & Transducers Balanced Armature Speaker | Speakers & Transducers Balanced Armature Speaker |
| Manufacturer | Knowles | Knowles | Knowles |
| Product Category | Speakers & Transducers | Speakers & Transducers | Speakers & Transducers |
| RoHS | Y | Y | Y |
| Product | Receivers | Receivers | Receivers |
| Type | Balanced Armature | Balanced Armature | Balanced Armature |
| Impedance | 125 Ohms | 630 Ohms | 630 Ohms |
| Length | 5 mm | 5 mm | 5 mm |
| Width | 2.73 mm | 2.73 mm | 2.73 mm |
| Depth | 1.93 mm | 1.98 mm | 1.98 mm |
| IP Rating | - | - | - |
| Packaging | Bulk | Bulk | Bulk |
| Series | FK | FK | FK |
| Brand | Knowles | Knowles | Knowles |
| Length in | 0.197 in | 0.197 in | 0.197 in |
| Length mm | 5 mm | 5 mm | 5 mm |
| Product Type | Speakers & Transducers | Speakers & Transducers | Speakers & Transducers |
| Factory Pack Quantity | 1 | 25 | 25 |
| Subcategory | Audio Devices | Audio Devices | Audio Devices |
| Width in | 0.107 in | 0.107 in | 0.107 in |
| Width mm | 2.73 mm | 2.73 mm | 2.73 mm |
| Frequency | - | 6.5 kHz | 6.5 kHz |
| Sound Pressure Level | - | 107 dBA | 107 dBA |
| Shape | - | Rectangular | Rectangular |
| Termination Style | - | Solder Pad | Solder Pad |