An improved LED communication system that expands Stop & Go coverage to the top of a dock door. These signal lights integrate with professionally installed dock restraint systems, changing from red to green when it is safe to enter a properly secured truck. Easily install the light set above a dock door header with the included stand-off pipe. Use with the Linear Light for full-coverage door signaling that reduces the risks of accidents. Measures 19"H. x 19"W. x 18-3/4"D. Available in 12 volt DC. FOB Shipping Point. - Improves visibility in the warehouse. - Reduce blind spot errors - Long-life LED's eliminate replacement costs. - 12 VAC/VDC - 5-year warranty See Related Items tab for LED Stop & Go Linear Light.