The C13 is a highly versatile PA ceiling speaker, designed for public address, fire alarm, voice evacuation and emergency response systems. It has an integrated, precision transformer for stable operation on 70/100 V broadcast lines. With 3W/6W power and a 6-inch speaker driver, it provides clear sound efficiently.
link:https://www.loudspeakerchina.com/ceiling-speakers/pa-ceiling-speaker.html