Bidirectional sound projector. Aluminum body, 10W power, ultra small mounting bracket. Suitable to be mounted in public and industrial areas. Quality sound restoring, 100V transformers power taps, and 180Hz – 18kHz frequency response make these sound projectors suitable for music reproduction as well as for voice announcements. SPMB 10 has built-in two 5" (127 mm) full range speakers.