Monitoring technology from last centuries 80 time enter since our country, with the security of the sharp increase in demand has been in rapid development. From a technical point of view, Wireless keyboard has gone through many different stages of development. In 2000 China's first domestic DVR came out, began to enter the China security industry. Subsequently, in the technology and market of double drive, DVR began to make a spurt of progress of development. By 2006, the DVR has occupied the...
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