The OMNITRONIC WPS-4S is a passive 2-way bass-reflex wall speaker for 100 V public address systems. It has a 4-inch woofer and tweeter, 20 W RMS rated power, and selectable power taps of 2.5 W, 5 W, 10 W, and 20 W RMS. The trapezoidal ABS cabinet includes a pivotable mounting bracket and is suitable for fixed installations in restaurants, hotels, sports facilities, and similar indoor environments.