One of the highest-demand items after Hurricane Maria knocked out power in Puerto Rico was simple solar lights.  This is an ultra-bright 15-LED outdoor solar light than can be easily attached anywhere outdoors where the sun can charge it during the day for perimeter security or general area lighting.  This light has an automatic and manual on/off switch so it turns on when it gets dark and turns off when it's light enough to charge it for the next night.  We highly recommend this!