System Sensor 5602 194°F Fixed Temp/Rate-of-Rise， Single-Circuit Mechanical Heat Detector<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Multiple configurations for installations: – Single- and dual-circuit models – Fixed temp and combination fixed- temp/rate-of-rise 135°F or 194°F ratings.</li><li>Easy-to-use terminal screws</li><li>A broad range of back box mounting options: – Single gang – 3.5? and 4? Octagonal – 4? square with square to round plaster ring</li><li>Reversible mounting bracket</li><li>The reversible mounting bracket permits both flush- and surface-mount back box installations.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41vzFbRFtSL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/311ppRKsvvL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Hz0QiVJ%2BL.jpg" noproxy>