| PartNumber | EF-21933-000 | EF-21935-000 | EF-21937-000 |
| Description | Speakers & Transducers 7.87 X 5.59 X 4.01MM 125 SENS, 12S PORT | Speakers & Transducers 7.87 X 5.59 X 4.01MM 125 SENS, 12S PORT | Speakers & Transducers 7.87 X 5.59 X 4.01MM 126 SENS, 12S PORT |
| Manufacturer | Knowles | Knowles | Knowles |
| Product Category | Speakers & Transducers | Speakers & Transducers | Speakers & Transducers |
| RoHS | Y | Y | Y |
| Product | Receivers | - | Receivers |
| Frequency | 6.3 kHz | - | 6.3 kHz |
| Sound Pressure Level | 126.5 dBA | - | 126 dBA |
| Impedance | 1.275 kOhms | - | 641 Ohms |
| Termination Style | Solder Pad | - | Solder Pad |
| Length | 7.87 mm | - | 7.87 mm |
| Width | 5.59 mm | - | 5.59 mm |
| Depth | 4.06 mm | - | 4.06 mm |
| IP Rating | - | - | - |
| Packaging | Bulk | Bulk | Bulk |
| Series | EF/FEF | EF/FEF | EF/FEF |
| Brand | Knowles | Knowles | Knowles |
| Length in | 0.31 in | - | 0.31 in |
| Length mm | 7.87 mm | - | 7.87 mm |
| Product Type | Speakers & Transducers | Speakers & Transducers | Speakers & Transducers |
| Factory Pack Quantity | 25 | 25 | 25 |
| Subcategory | Audio Devices | Audio Devices | Audio Devices |
| Width in | 0.22 in | - | 0.22 in |
| Width mm | 5.59 mm | - | 5.59 mm |