Dahua 4MP DH-SD49425XB-HNR DH-SD49425GB-HNR 25x Starlight IR PTZ AI Network Camera

Model: DH-SD49425GB-HNR

Who This Is For

For security integrators and site managers who need a single camera to cover long approaches, wide yards, or multi-zone outdoor areas without running extra camera positions, the Dahua SD49425GB-HNR is a 4MP PTZ built around a 25x optical zoom and Starlight low-light imaging. It suits commercial properties, industrial yards, car parks, school perimeters, and logistics sites where fixed cameras would require five or more units to achieve the same coverage. The combination of motorised zoom, continuous 360-degree pan, and AI-based smart tracking means the camera can lock onto a moving subject and follow it across a large area automatically. IR illumination extends usable night vision beyond what most fixed cameras achieve, making this a strong candidate for any site where coverage flexibility and low-light performance are the primary brief.

What This Camera Actually Does

Who Buys This Model

• Industrial Site Managers: Large yards with long perimeter fences and multiple access points, where the 25x zoom and auto-tracking replace several fixed cameras along a single approach.
• School and Campus Security Teams: Broad outdoor grounds that need active patrol coverage across playgrounds, car parks, and entry points using preset positions and scheduled tours.
• Logistics and Warehouse Operators: Loading dock areas and external hardstands where a single PTZ can patrol zones during unmanned overnight hours and auto-track any movement that triggers perimeter rules.
• Commercial Property Managers: Multi-tenancy sites or retail centres where a PTZ on a high mounting point provides broad coverage and can be directed in real time by a security control room.
• Security Integrators: Professionals reducing camera count on large-footprint projects where PTZ positions are combined with fixed cameras to achieve full coverage without running excessive cable infrastructure.

Honest Assessment

The SD49425GB-HNR does several things well: the 25x optical zoom gives genuine long-range detail retrieval, the Starlight sensor handles poor lighting better than most comparable PTZ cameras at this price point, and the AI smart tracking removes the operational overhead of manual PTZ control in unstaffed environments. The 4MP sensor keeps zoomed footage detailed enough to be investigation-grade rather than just evidential in broad strokes.

What it will not do is replace fixed cameras entirely. A PTZ can only look in one direction at a time - if you have multiple simultaneous access points that all need continuous coverage, you need fixed cameras supporting the PTZ, not the PTZ alone. It also requires PoE+ (IEEE 802.3at) rather than standard PoE, so check your switch specifications before ordering. Available through Security Australia, this model suits sites where coverage range and flexibility are the priority, not high-density simultaneous monitoring across many fixed points.

Before You Buy

Quick Fit Check

• Good match if: You need a single camera to actively patrol a large outdoor area - yard, perimeter, or car park - and want AI auto-tracking to follow subjects without a live operator at the controls.
• Good match if: Your site has long approaches or wide open areas where you need the 25x optical zoom to identify subjects at distance with 4MP clarity, and you have PoE+ capable switching infrastructure already in place.
• You may need a different model if: Your requirement is continuous simultaneous coverage of multiple fixed points - entry doors, tills, or multiple lanes - where fixed IP turret or bullet cameras covering every position permanently would serve the brief better than a single PTZ that can only face one direction at a time. Browse the fixed camera range at securityaustralia.com.au for those applications.

Key Features & Technical Specifications

Real-World Scenarios

How It Compares

• Choose this if: Your site has large open areas, long approaches, or wide perimeters where a single camera with 25x optical zoom and AI auto-tracking replaces multiple fixed camera positions and active monitoring can be automated.
• You may need a different model if: Your requirement is simultaneous continuous coverage of multiple fixed points - a PTZ can only watch one direction at a time. A system of fixed IP bullet or turret cameras will deliver permanent uninterrupted coverage across every position without relying on the PTZ being pointed in the right direction at the right moment.
• Pairs well with: Fixed IP turret or bullet cameras covering entry points and choke points permanently, with this PTZ handling broad patrol and AI-triggered tracking across the wider site area.

Common Questions

1. Does this camera require PoE+ or will a standard PoE switch work?

   It requires IEEE 802.3at PoE+ - standard IEEE 802.3af PoE will not reliably power this unit. The PTZ drive mechanism, IR illuminators, and processing draw more than the 15.4W ceiling of standard PoE. You need a switch or NVR with 802.3at PoE+ rated ports delivering at least 25.5W per port, or a dedicated PoE+ injector at each camera location.

2. Will this camera auto-track moving subjects without an operator at the controls?

   Yes. The AI smart tracking function detects and classifies a moving person or vehicle within a defined zone, then automatically pans, tilts, and adjusts zoom to keep the target in frame. Tracking continues until the subject leaves the camera's coverage area or a defined tracking timeout is reached. No live operator input is required once the function is configured and enabled.

3. How does the 25x optical zoom actually work and what can it identify at range?

   The 25x optical zoom uses glass lens elements to magnify the image without any digital processing, so image quality does not degrade as you zoom in the way digital zoom does. Combined with the 4MP sensor, this allows the camera to produce detail-usable footage at distances that would be out of range for any fixed lens. Practical identification capability at range depends on mounting height, angle, and lighting conditions - but for number plate reading or face-level detail in a large open area, the combination of 25x optical and 4MP resolution performs substantially better than a 2MP or fixed-lens equivalent.

4. What is the pan and tilt range of the SD49425GB-HNR?

   The camera pans continuously through 360 degrees with no physical stop, meaning it can complete full rotations for patrol tours without reversing direction. Tilt range is -15 degrees to 90 degrees with auto-flip, which allows the camera to track a subject passing directly underneath the mounting point by flipping the image rather than stopping at the mechanical tilt limit. This makes it suitable for elevated mounting positions where subjects regularly pass directly below.

5. Does the AI perimeter protection reduce false alarms compared to standard motion detection?

   Yes, significantly. Standard motion detection triggers on any pixel change - wind-blown foliage, passing headlights, insects near the lens, and rain all cause false alerts. The AI perimeter function on the SD49425GB-HNR classifies what triggered the rule. You can set it to alert only on humans, only on vehicles, or both - which means environmental movement that does not match a classified target type is ignored. In open outdoor sites this typically reduces nuisance alerts by a large margin compared to motion-based systems. The stocked range at Security Australia includes compatible Dahua NVRs that display these AI event classifications directly in the event timeline.

6. Is this camera suitable for outdoor installation in Australian weather conditions?

   Yes. The IP66 rating means the housing is fully sealed against dust ingress and protected against powerful water jets, which covers driving rain and hose-down environments. The IK10 vandal resistance rating means the dome housing withstands a 20-joule impact - equivalent to a 5kg mass dropped from 40cm. These ratings make it suitable for exposed outdoor positions on industrial sites, car parks, school yards, and building exteriors.

7. How many preset positions can this PTZ store and how are patrol tours configured?

   The SD49425GB-HNR supports a large number of preset positions - specific positions are defined in the camera's web interface or via a compatible VMS or NVR. Patrol tours are configured by assigning preset positions to a tour sequence and setting the dwell time at each position. This allows the camera to automatically cycle through key locations - gate, loading dock, yard, entry - on a timed schedule without any operator input. Tour schedules can typically be set to run at specific times of day, so the camera patrols actively during unmanned hours and switches to manual or event-driven control during staffed periods.

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