OSD Audio OVC50 Outdoor Volume Control Impedance Matching 60W Rotary Knob Weather Resistant Housing<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> WEATHER-RESISTANT - Resistant to rain， snow， heat </span></li><li><span class="a-list-item"> POWER RATING - 50 watts peak and 25W RMS </span></li><li><span class="a-list-item"> DIMENSIONS - 3-1/4" x 3" x 4-3/8" </span></li><li><span class="a-list-item"> MOUNTING - Use 3/4" PVC Conduit Pipe to stand alone or mount to the wall </span></li><li><span class="a-list-item"> IMPEDANCE MATCHING - 1/2x， 4x， or 8x </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41wySBp8RKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31QI5Uug-pL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31T2OZKGyyL.jpg" noproxy>