What type of technology is used to alert deaf individuals to various signals?

The use of vibrations and visual signals is essential in assisting deaf individuals by providing alternatives to auditory alerts. Since they cannot hear traditional audio alarms, which are designed to notify through sound, it becomes necessary to rely on non-auditory methods of communication and alerting.

Vibrations can be emitted through devices like vibrating wristbands or pagers, providing a physical cue that an important event, such as a doorbell or alarm, has occurred. Visual signals, such as flashing lights or text displays, also serve to convey information that would otherwise be communicated through sound. This dual approach ensures that deaf individuals have access to critical alerts in their environment.

In considering the context of the other options, audio alarms would not be effective for deaf individuals, while text alerts alone may not encompass all potential alerts in real-time situations. Standard loudspeakers similarly offer no benefit, as they rely on sound to convey messages. Therefore, vibrations and visual signals stand out as the most inclusive and effective technology for alerting deaf individuals to various signals.