Shandong united safe co;ltd started in the year of 1998 by three experts who engaged in public safety equipment for ontrol system which can help us to make good quality products. From the beginning of raw material purchasing to mass production and to the quality control of finished products we do our best to make every procedure of them going perfect. As well we offer one year warranty which means replace the defective parts during the warranty period. With our excellent marketing team effort, our products gain positive feedback from our customer all over the world. Most of the customers established business relationship with us lasting for many years, it¡¡£¤s great honor to support our customer growing business fast.