What is a "visual alarm device"?

A visual alarm device is specifically designed to alert individuals through visible indicators, such as flashing lights or strobe lights. This type of device is particularly beneficial in situations where auditory alarms may not be heard, such as in loud environments or for individuals who are hearing impaired. By using light to draw attention, it ensures that people are notified of an alarm condition effectively.

In contrast, the other options focus on different types of alert mechanisms. Sound-producing devices are audible alarms that rely on sound to notify people, while video recording systems are utilized for surveillance and do not serve as direct alerts. Similarly, devices providing vocal instructions focus on communicating information verbally, rather than visually. Hence, the emphasis on visual alerting makes the choice of a device using flashing lights as the correct definition for a visual alarm device clear.