Best for Alarm/siren loudness (if included)
Aqara Smart Lock U100
4.0 feature score
Highest scored product for this feature based on supporting review evidence.
Best Smart Home for Alarm/siren loudness (if included)
Alarm/siren loudness (if included) Decision Dashboard
Safest pick
Schlage Encode Smart Lock
3.5 feature score
Balances feature score, supporting reviews, and overall product strength.
Most evidence
Aqara U50 Smart Lock
2 supporting reviews
Has the broadest review evidence for this feature.
Best overall product
SwitchBot Lock Ultra
4.0 overall score
Strongest overall product among items with scored evidence for this feature.
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The built-in speaker/alarm was viewed as useful rather than extremely loud, with reviewers appreciating open-door and warning alerts.
Pros: Lock/unlock speed, Fingerprint
Cons: Keyway quality, Wi-Fi
Alarm loudness was split: one review called the siren quiet, while a locksmith found it very loud and annoying.
Pros: Bluetooth, Hub requirement
Cons: Door-sense, Fingerprint
Alarm and sound controls are useful and adjustable, but one reviewer found the default voice volume very loud and hub-dependent to change.
Pros: Access logs, Value and Price
Cons: Warranty and support, Wi-Fi
The keypad speaker is clearly audible, but one reviewer found the voice prompts annoying enough to lower the score.
Pros: App, Battery
Cons: Geofencing, Jam detection
The built-in alarm was criticized as too quiet, even by reviewers who liked having forced-entry detection available.
Pros: Locking reliability, Lock/unlock speed
Cons: Weather resistance, Door-sense