40-watt ceiling speaker typically features a 40W RMS input power with multi-tap options for 100V systems, a frequency response between 90Hz and 18kHz or higher, and a sensitivity of approximately 90-93dB. It often includes both a woofer (e.g., 8-inch) and a tweeter for a full-range sound, and comes with features like a steel grille, an easy-install mounting system, and a durable, weather-resistant design for commercial or home use.