DAHUA DVR 4CH.

A Dahua 4CH DVR (Digital Video Recorder) is the core device in a CCTV surveillance system that captures, compresses, stores, and manages video from up to four connected cameras. It connects to cameras via coaxial cables (or hybrid inputs on newer models) and stores recordings on an internal HDD (hard drive) — often up to 6 TB or more — letting you review live or past footage through a monitor or remote app.

🔑 Key Features

• 4 Camera Inputs: Supports up to four analog or hybrid CCTV cameras (HDCVI, AHD, TVI, CVBS, and some IP extension).

• High‑Definition Support: Many modern Dahua DVRs can record up to 1080p or 5 MP resolution, giving clearer video than older standard definition recorders.

• Video Compression: Uses H.265+ or H.265/H.264 compression standards, which save storage space while keeping video quality high.

• Large HDD Support: Most models allow 1 SATA HDD up to ~6 TB, enabling long‑term storage without frequent overwrites.

• Motion Detection & Alerts: Detects movement and supports event‑based recording to save space and improve security.

• Playback & Backup Options: Watch recorded footage on‑device or export via USB, network, or app.

• Multi‑Format Input (Hybrid DVRs): Some DVRs support analog (CVBS), HD over coax (HDCVI/AHD/TVI), and IP cameras — giving flexibility in camera choice.

• Remote Monitoring: Works with Dahua’s mobile apps (e.g., DMSS) for live view, playback, and alerts on smartphones and PCs.

📈 Typical Uses

✔ Home Security: Monitor entrances, lawns, living areas, and gateways.
✔ Small Office & Shop Surveillance: Keep an eye on cash counters, customer areas, and storage.
✔ Warehouse & Backroom Monitoring: Track activity over larger areas with multiple cameras.
✔ Remote Monitoring: View camera feeds from anywhere via smartphone apps.