4-in-1 CCTV is a new hybrid format, allowing HD-TVI, AHD, HD-CVI and CVBS cameras to be connected to the DVR. This means you no longer have to worry about format compatibility when setting up or updating a CCTV security system - as long as it has a BNC connection and uses coaxial cable then it should work. Hikvision 4-In-1 DVR supports Multiple HD Video formats over coaxial cable (RG59)

        HD-TVI:  HikvisionTurbo HD
        AHD:  Analogue HD
        HD-CVI:  Composite Video Interface
        CVBS:  Analogue TV Lines format using BNC
        Connectable to Turbo HD/HDCVI/AHD/CVBS signal input
        Long distance transmission over UTP and coaxial cable
        One-key enable H.264+ compression to improve encoding efficiency by up to 50% and reduce data storage costs
        Supports real-time 1080p lite and when enabled, the image effect is similar with 1080p
        HDMI/VGA output at up to 1920 × 1080 resolution
        One SATA interface (up to 6 TB capacity per HDD)
        4/8/16-ch synchronous playback
        Smart search for efficient playback