SPM 20 is a 20 W sound projector with an aluminum body and U-bracket, designed for installation in public and industrial areas where product design and high-quality sound reproduction is the priority. It has 5" (127 mm) full-range speaker. With built-in 100V transformer with power taps, 140° sound dispersion, and a frequency response of 130 Hz – 15 kHz, the SPM 20 is suitable for both music playback and voice announcements.