Hello!
The ceremony does include a microphone and speaker, so guests can hear the minister and your vows. I avoided costs anywhere possible so I brought my own speaker to play music during the free cocktail hour. They will charge you if you decided to use their speaker. The music wasn't as loud as I had hoped (we we were on the beach and I had a little speaker)but we did our first dance and our guests enjoyed it and were able to hear our song. Everyone still danced around and clapped along
Happy Planning!