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Hello, Can someone explain me the meaning of the letters at the end of the models? I am looking for a 8ch NVR, but I`m getting confused by the number of similarly looking models For example: DS-7608NXI-K2 DS-7608NI-Q1/8P(C) DS-7608NXI-I2/8P/S(C) DS-7608NXI-K1/8P DS-7608NXI-K1...