Which color is associated with plain voice mode?

• A. Red
• B. Green
• C. Blue
• D. Yellow

Answer: (A)

Color indicators on radios are designed for quick recognition of how a transmission is carried. Plain voice mode means the conversation is unencrypted and not protected. In many systems, red is used to signal unencrypted or non-secure status, so you immediately know the transmission could be intercepted and should avoid sharing sensitive information. This visual cue helps operators stay aware of security posture without reading a label. Other colors are reserved for different states: green often signals secure/encrypted or an active channel, blue can denote digital or data modes, and yellow is commonly used for caution or standby. Therefore, red is the color associated with plain voice mode.