Avision IS1000 (BF-1008S) - Manual (Page 75)

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How to add the sound alarm：
1. Click the Browse button on the right side of the speaker
icon. The Open dialog box appears.
2. Choose your wave file.
3. Click the Open button. The wave file is added.
Units
Defines the primary measurement system. Inches,
Millimeters, and Pixels are available.