Please provide the answer that you understand.
2. This relates to the firmware, and since the author didn't implement this voice prompt feature, it's not present. Generally, such features don't take up much space and aren't particularly important; I haven't seen any DIY projects that include them.
3. The reason for prohibiting transmission is usually due to an incorrect mode setting. Sometimes, after a reset, the default mode is AM, but this particular device operates in FM mode. Therefore, it's necessary to disable transmission and then change the settings back to FM mode. I personally set it to long-press the "M" key to cycle through the different modes (AM, USB, FM).
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