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* Update: Many new units utilize H.265 which provides much better compression, however, video playback might not be possible on computers with old software. The latest VLC will playback H.265.=== Questions to Ask Seller ===''updated for 2021'':* Standard BNC analog connectors:* new 1080P, 3MP(12.5fps), 4MP(12.5fps), 5MP(12.5fps) CCTV Security Cameras and Compatible with all 1080P, 960P, 720P, TVI, AHD, CVI and Traditional Analog Cameras.:* What video format does it record in? (many new units are H.265 which is good):* Selective footage delete capability (can delete specific amounts of video without deleting all of the video):* Can it record sequential JPEG/image stills and video?:* Can it record video at at least Half D1 (NTSC)?:* Can the video be accessed via network share and easily played back on a PC?:* For the TCP/IP setup, can it be assigned a static network IP address of my choice?:* Does it support getting an address via DHCP?:* Will it accept a standard 3.5" PC SATA hard drive?:* Is there full control via remote access from a PC so it can be ran headless?:* USB Port to copy files or backup video footage to a thumb/flash drive?:* Is the motion detection sensitivity adjustable?:* When motion detect is active, the unit is recording, can it also be accessed remote with full functionality? (''Simplex/Duplex/Triplex''):* If the remote interface is web browser accessible, is it Firefox compatible for viewing on Macintosh and Linux desktops? (many require MSIE specific plugins which is unacceptable):* Does not require subscription based cloud storage (avoid subscription based):* Can be accessed directly via IP address or port map for remote access (the traditional means of mapping via the router)* Watch out for "Upgrade to Advanced Functions" or "Licensed Software not included" - You want to make sure you get a fully functional unit with full functional remote management without having to pay any additional costs for licensing software or getting software keys after your purchase - hidden costs.There's no point in producing top quality images if the DVR is only going to record them at a low quality. There are 3 industry standard recording resolutions:There's no point in producing top quality images if the DVR is only going to record them at a low quality. There are 3 industry standard recording resolutions: (''this section needs revised for NTSC resolutions instead of PAL'')== External Resources ===== CCTV Forums ===* CCTV Forum - https://www.cctvforum.com/=== Vendors / Stores ===Not endorsed, simply a list that we have discovered. * CCTV Security Pros - https://www.cctvsecuritypros.com/* CCTV Camera World - https://www.cctvcameraworld.com/