Noise Cancelling
| Model no. | Spec. | Dimension | Download |
| OBO-08DN-0C | -47db +/-4db, 2V, 2.2KΩ | 6 dia. * 2.7mm |  |
| OBO-20DN-0C | -50db +/-4db, 1.5V, 680Ω | 9.7dia. *5mm | |
| OBO-64DN-0C | -44db +/-4db, 2V, 2.2 KΩ | 6 dia. * 2.7mm | |
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