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| PartNumber | FED-26788-I04 | FED-26554-I04 | FED-26565-I04 |
| 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 | - |
| Type | Balanced Armature | Balanced Armature | - |
| IP Rating | - | - | - |
| Packaging | Bulk | Bulk | - |
| Series | ED/FED | ED/FED | - |
| Brand | Knowles | Knowles | - |
| Product Type | Speakers & Transducers | Speakers & Transducers | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Audio Devices | Audio Devices | - |
| Frequency | - | 500 Hz | - |
| Impedance | - | 350 Ohms | - |
| Shape | - | Rectangular | - |
| Termination Style | - | Solder Pad | - |
| Length | - | 6.3 mm | - |
| Width | - | 4.29 mm | - |
| Depth | - | 2.97 mm | - |
| Length in | - | 0.248 in | - |
| Length mm | - | 6.3 mm | - |
| Width in | - | 0.169 in | - |
| Width mm | - | 4.29 mm | - |