Which of the following is true of pyrotechnic visual distress devices?

Pyrotechnic visual distress devices, such as flares, indeed have an expiration date. This is critical for their effectiveness in emergency situations; over time, the chemical components in these devices can degrade, reducing their reliability when needed most. The expiration date is usually printed on the device or its packaging and indicates the period during which the device is guaranteed to function properly.

While some devices may appear to be still intact after their expiration date, they may not emit the intended signal or may function unsafely. It is essential for users to regularly check these devices and replace them before their expiration to ensure their safety and adherence to regulations regarding safety equipment for boating and other activities requiring distress signaling.