The Potter Speaker SHX52 is a patented indoor/outdoor, self-contained, 8 ohm, 15 watt speaker. The full featured speaker consists of a light weight, strong polycarbonate housing and dual-action plunger switch for tamper supervision for a normally closed loop. The speaker does not require additional modules, metal boxes, tamper switches, special tools, or training to install and operate. The SHX52 series comes completely assembled and ready for installation. It is ideally suited for noisy, heavy, machinery areas, warehouses, loading docks, print shops, and busy production floors, or for indoor/outdoor applications where high quality and high output warning is required. Also known as -Amseco/Potter SHX51 ARMRD HRN 15W/ TMP - AS-SHX52