high brightness, easy installation, stable and reliable, needs not laying cable, no consumption conventional energy, long life. The material: die-casting aluminum or copperThe size: 19cmL x 19cmW x 36cmHThe solar module: 2w/ 7vController: sensitive to light , crowbar protect. Undervoltage overflow protect.Battery: special for solar module, capacity: 3.6v/ 18000mAHLED : φ8,1W.