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The DVR records video from multiple cameras onto hard drives. In the case of AHD cameras, the DVR needs to be compatible with AHD signals to properly record and playback the footage. The DVR processes the analog HD signal from the cameras and converts it into digital format for storage and viewing.

Compatibility: AHD cameras can often work with existing analog coaxial cable systems.

Cost-Effective Upgrade: Switching to AHD cameras can be a more budget-friendly upgrade compared to a full IP camera system.