Foscam FI9903P User Manual page 65

If the Sensitivity is set to High, the camera will detect the sound whose more than 55db.
If the Sensitivity is set to Medium, the camera will detect the sound whose more than 65db.
If the Sensitivity is set to Low, the camera will detect the sound whose more than 75db.
If the Sensitivity is set to Lower, the camera will detect the sound whose more than 85db.
If the Sensitivity is set to Lowest, the camera will detect the sound whose more than 95db.
4.6.3 IO Alarm (only FI9805E)
This IP camera provides a IO alarm terminal block which is used to connect to external input / output device.
The alarm device (door sensor, infrared sensor, smoke detectors, etc) send input command to the network
camera, then the network camera send output command to the alarm output device (local audible alarm, lights
alarm,etc).
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