What is a key characteristic of the MK-124 distress signal found in the survival vest?

A key characteristic of the MK-124 distress signal is that it is a compact signaling device. This feature makes it highly portable and easy to carry, allowing individuals to have an effective means of signaling for help without being burdened by size or weight. The MK-124 is designed to be easily accessible in survival situations, making it practical for use in emergency scenarios.

Other options, while they may sound plausible, do not accurately characterize the MK-124. For instance, the distress signal is not solely limited to nighttime use; it is designed for both day and night with different signaling modes to maximize visibility depending on the conditions. Additionally, while it is constructed to withstand various environmental factors, claiming it operates on solar power or that it is entirely waterproof does not accurately reflect the specific attributes of the device. Understanding these characteristics ensures that users can effectively utilize the MK-124 in a survival context.