The Model 9200-0008 is an Edwards indoor/outdoor weatherproof horn with adjustable volume control. The adjustable output is 78 to 103 dB with a 400-hour rating at a 50 percent duty cycle. This horn works in conjunction with Microframe's Visual-Pager® displays equipped with a Triac output driver. The horn provides a distinct, audible signal in the loudest environments. Designed for commercial or industrial use, it is ideal for timed sporting events (i.e. as a shot clock).