The Simplex® 4902-9721 speakers provide high quality sound for emergency fire alarm use as well as for background music.  The moisture-repellent speaker is designed for smooth frequency response with minimal distortion.  The multi-tapped speaker transformer accommodates either 25 or 70.7 VRMS and provides an output from 1/4 to 2 W to provide flexibility for satisfying the requirements of the installed conditions.  The round housing model is typically for ceiling applications but can be wall mounted if desired.