The SHX-52 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 SHX-52 series comes completely assembled and ready for installation.