'Trumpet' in the Bible

I was in the Spirit on the Lord’s day, and I heard behind me a loud voice like the sound of a trumpet,

After these things I looked, and behold, a door standing open in heaven, and the first voice which I had heard, like the sound of a trumpet speaking with me, said, “Come up here, and I will show you what must take place after these things.”

Then I looked, and I heard an eagle flying in midheaven, saying with a loud voice, “Woe, woe, woe to those who dwell on the earth, because of the remaining blasts of the trumpet of the three angels who are about to sound!”

one saying to the sixth angel who had the trumpet, “Release the four angels who are bound at the great river Euphrates.”