The Nooie Cam Doorbell chime be turned either on or off, but the volume cannot be adjusted. The volume of the Base Station can be adjusted. See: How do I adjust the volume of the Base Station?
To turn the Doorbell sound on or off:
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Open the Nooie App, tap on Nooie Cam Doorbell
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Tap on the Setting icon on the top right
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Tap Audio / Video
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Next to Doorbell Sound, tap on the toggle to turn the doorbell sound on and off.