Foscam R2 User Manual page 54

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 Human Detection (R2 Only)
IP Camera supports Human Detection Alarm, when the people has been detected, the IP Camera will
make an alarm.
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