1. the map body and pole use aluminum alloy. the surface is plastic-sprayed and its conjunction pieces are casting pieces. 2.the penetrating cover is made of PMMA. 3.the lamp consists of two suits of LED lamp-house, each of which includes 18 white light LED of 0.5W. when normally working, its total power is 18W 4. the lamp-house operates with high radiation efficiency, which is of luminescence type, low energy consuming and with no dazzling light. 5.the protection level of the lamp is IP65 while the shock protecting measures falls into 2 category 6.LED is installed on a hexagon heat-elimination aluminum board, which has well solved the heat elimination problem of LED,and ensures the stability of the radiation of LED and its life-span.