If a speaker is connected to the EAD10 output terminal, it can be used as a simple PA system. You won't have to spend time mic-ing drums during live performance.
Also, if you have a USB memory, you can record your own drum performance for up to 90 minutes.
Learn more about EAD10: https://www.yamaha.com/ead/
EAD10 Web Manual: https://manual.yamaha.com/mi/bo/ead10/