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"YULI" brand Rome Road-block mark light is made of engineering plastic. The product was equipped with two size D dry batteries,it can be used for 600 hours. We use imported LED lamp as light source ,the visual distance can reach 1000 meters and the flash frequence is 80 times per minute. The LED lamp can be use for a very long time no needed to be replaced. By using light-control devices, the light can be automatically switched off in daytime and switched on at night or in the fog and rainy day.(the product also can be equipped with human-control device). The product is waterproof , moistureproof, aseismatic and can be used well in tough weather conditions.