Algo 1186 Weatherproof Paging Horn Loudspeaker Rugged weatherproof UV stabilized ABS enclosure with stainless steel hardware Rated for indoor or outdoor installation including wet environments Interfaces easily with the 8180 and the 1825 to provide increased ringing or voice notification volume (up to 112 dBA spl at 1m (3.3ft.) Commercial duty loudspeaker is ideal for business, marine, and military applications Metal mounting base is ceiling / wall-mountable and features T-knob three-axis swivel adjustment