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| Part Number | BU-21771-000 | BU-27135-141 | BU-23842-141 | BU-23842-000 | BU-27135-000 |
| Manufacturer | Knowles | Knowles | Knowles | Knowles | Knowles |
| Series | BU | BU | BU | BU | BU |
| Package/Case | Box | Ceramic | Ceramic | Box | Box |
| Packaging | Bulk | Tray | Tray | Bulk | Bulk |
| Product Status | Active | Active | Active | Active | Obsolete |
| Sensor Type | Vibration, Acceleration | Vibration, Acceleration | Vibration, Acceleration | Vibration, Acceleration | Vibration, Acceleration |
| Sensing Range | - | - | - | - | - |
| Sensitivity | -45dB ±4.5dB | -45dB ±4.5dB | -40dB ±3dB | -40dB ±3dB | -45dB ±4.5dB |
| Output Type | Voltage | Voltage | Voltage | Voltage | Voltage |
| Power - Rated | - | - | - | - | - |
| Operating Temperature | - | - | - | - | - |
| Features | - | Waterproof | Waterproof | - | - |
| Mounting Type | Surface Mount | User Defined | User Defined | Surface Mount | Surface Mount |
| Termination | Solder Pads | Solder Posts | Solder Posts | Solder Pads | Solder Pads |
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