Water Sensor Alerts

I bought two water sensors and they are working fine. The issue I am having is that, the base station is on the first floor, when the station announce a "Water Detected" I can't hear it in the second floor. How I can extend the audio from the station to the second floor? Chime extender, is not what I am looking for, that is only for motion and door contacts, water sensors are not included. Alexa is not able to detect water sensors, so is not an option to set a routine in Alexa for that. Thank you.