What kind of alerts can be typically expected from a motion sensor in a residential security system?

Motion sensors in a residential security system are primarily designed to detect movement within their designated areas. When motion is detected, the sensor will trigger an alert, which is typically a notification that informs users of this activity. The alerts can take various forms, such as sending notifications to a control panel, an app, or a monitoring service, but fundamentally, they communicate that motion has been detected.

This type of alert is crucial for enhancing home security, as it allows homeowners to be aware of any unexpected movements that may indicate potential intruders or other security issues. While the sensor may trigger other actions, such as alarms or connecting to a monitoring service, the core function remains focused on notifying about the detection of motion.

The other answer choices imply outcomes that are less typical or specific to the primary functionality of motion sensors. Silent notifications and immediate alerts to emergency services depend on how the security system is configured, and visual alerts on smartphones are not universally applicable to all motion sensors. Thus, the essence of the motion sensor's role is best captured by alerts indicating motion detection.