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Description
Dahua SD7A840FA-HNF 8MP 40X IR High-Speed Network PTZ CameraDahua SD7A840FA HNF 8MP 40x IR High Speed PTZ Camera 4K @60fps, 700 s Pan, 4,400m DORI, NEMA 4X Key Performance Highlights 8MP 4K Ultra High Speed PTZ + 60fps + 140dB WDR 8MP 4K Resolution & 40 Optical Zoom: 5. 5220 mm motorized zoom lens (F1. 6F4. 9) exceptional detail from wide to ultra tele. Extreme High Speed PTZ: Pan speed up to 700 s, tilt up to 300 s; preset speed 550 s (pan). Smart pan tilt correction with 0. 05 positioning accuracy. High
Dahua SD7A840FA-HNF 8MP 40x IR High-Speed PTZ Camera – 4K @60fps, 700°/s Pan, 4,400m DORI, NEMA 4X
Key Performance Highlights – 8MP 4K Ultra-High-Speed PTZ + 60fps + 140dB WDR
- 8MP 4K Resolution & 40× Optical Zoom: 5.5–220 mm motorized zoom lens (F1.6–F4.9) – exceptional detail from wide to ultra-tele.
- Extreme High-Speed PTZ: Pan speed up to 700°/s, tilt up to 300°/s; preset speed 550°/s (pan). Smart pan-tilt correction with 0.05° positioning accuracy.
- High Frame Rate Flexibility: 8MP/4MP/3MP @ 50/60 fps or 1080p/720p @ 100/120 fps – ultra-smooth 4K video for fast-moving targets.
- 140dB True WDR & Gyro EIS: Excellent wide dynamic range plus built‑in gyroscope electronic image stabilization for stable video under vibration.
- 300m IR Illumination: 6 high-power IR LEDs provide long‑range night visibility up to 984 feet.
- Privacy Protection with Mosaic: Auto-masks detected faces or human bodies in real time – ideal for public or regulated environments.
- Advanced Xinghan AI: Video metadata (10 vehicle/8 non-motor/6 face/8 body), face recognition (10,000 faces, 5 databases), IVS perimeter protection, AcuPick, WizTracking.
- Rugged Protection: IP67/IK10, NEMA 4X support, TVS 6000V surge protection. Operates –40°C to +70°C.
- Extreme DORI Distance: Tele end detect range up to 4,400 m (14,435 ft) – industry‑leading long-range identification.
Camera Specification – 8MP 4K High-Speed PTZ
Lens & DORI Optics (40× Optical Zoom)
| Image Sensor | 1/1.8" CMOS |
|---|---|
| Max. Resolution | 8MP – 3840 (H) × 2160 (V) – 4K Ultra-HD |
| ROM / RAM | 8 GB / 4 GB |
| Electronic Shutter Speed | 1/1 s – 1/30,000 s |
| Scanning System | Progressive |
| Min. Illumination | Color: 0.001 [email protected]; B/W: 0.0001 [email protected]; 0 lux (IR on) |
| Illumination Distance & Type | IR 300 m (984.25 ft) – 6 IR LEDs |
| Illuminator Control | Zoom Prio; Manual; Auto; Off |
| Focal Length / Aperture | 5.5 mm – 220 mm (40× zoom) | F1.6–F4.9 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Field of View | H: 60.82°–2.26°; V: 36.24°–1.26°; D: 68.7°–2.59° | |||||||||||||||
| Focus Control / Iris Control | Auto; Semi-auto; Manual | Auto/Manual/Iris Priority | |||||||||||||||
| Close Focus Distance | 0.5 m – 5 m (1.64 ft – 16.40 ft) | |||||||||||||||
| DORI Distance (EN-62676-4) |
|
Elite Intelligence – Xinghan AI with Privacy Protection
| Video Metadata | Motor vehicle (10 attributes), non-motor vehicle (8 attributes), face (6 attributes), human body (8 attributes). Supports snapshot optimization and high-quality face upload. |
|---|---|
| IVS Perimeter Protection | Tripwire, intrusion, crossing fence, loitering, abandoned/missing object, fast moving, parking detection, people gathering, human/vehicle classification, linkage tracking, privacy protection. |
| Face Recognition | 5 face databases (up to 10,000 faces), 6 attributes + 8 expressions, face cutout as one‑inch photo, batch import, similarity threshold, privacy protection. |
| Smart Tracking / AcuPick | WizTracking; AcuPick for fast human/vehicle search through live/recorded video. |
| Privacy Protection | Real-time mosaic masking – automatically covers detected faces or body parts in public scenes. |
Video & Audio Specifications – 4K @60fps, 140dB WDR
| Compression / Smart Codec | Smart H.265+; H.265; Smart H.264+; H.264; H.264B; H.264H; MJPEG (sub stream 1 only) |
|---|---|
| Streaming Capability | 3 streams |
| Resolution Options | 8M (3840×2160), 4M (2560×1440), 3M, 1080p, 1.3M, 720p, D1, VGA, CIF |
| Video Frame Rate |
Main stream: 8M/4M/3M @ 1–50/60 fps; 1080p/1.3M/720p @ 1–100/120 fps Sub stream 1: D1/VGA/CIF @ 1–25/30 fps Sub stream 2: 1080p/1.3M/720p/CIF @ 1–25/30 fps *High frame rate supported under monitoring mode only. |
| Bit Rate Control / Bit Rate | VBR/CBR. H.264: 128–16384 kbps; H.265: 51–11776 kbps |
| WDR / Image Enhancements | 140 dB True WDR, BLC, HLC, 2D/3D NR, ROI, Gyroscope EIS, Digital Zoom (16×), Image Rotation 180° |
| Privacy Masking | Up to 24 areas (max 8 in same view), selectable color block or mosaic |
| Audio Compression | PCM; G.711a; G.711Mu; G.726; MPEG2-Layer2; G722.1; G729; G723 |
PTZ & Mechanical Specifications – 700°/s High Speed
| Pan/Tilt Range | Pan: 0°–360° endless, smart pan-tilt correction; Tilt: –20°–+90°, auto flip 180°, smart pan-tilt correction (0.05° accuracy) |
|---|---|
| Manual Control Speed | Pan: 0.1–700°/s; Tilt: 0.1–300°/s |
| Preset Speed | Pan: 550°/s; Tilt: 300°/s |
| Preset / Tour / Pattern / Scan | 300 presets, 8 tours (32 presets each), 5 patterns, 5 scans |
| Idle Motion / Power-off Memory | Preset/Pattern/Tour/Scan; Yes |
| PTZ Protocol | DH-SD; Pelco-P/D (auto recognition) |
Network, Storage & Cybersecurity
| Network Port | RJ-45 (10/100/1000 Base-T – Gigabit) |
|---|---|
| Network Protocols | HTTP; HTTPS; TCP/IP; IPv4; IPv6; RTSP; UDP; SMTP; NTP; DHCP; DNS; DDNS; 802.1x; SSL; QoS; FTP; UPnP; SNMP; PPPoE; RTMP; Bonjour; NFS |
| Interoperability | ONVIF (Profile S/G/T/M); CGI; SDK |
| Local Storage | Micro SD card (max 1 TB); FTP; NAS |
| User/Host / Bandwidth | 20 users (total bandwidth 64 Mbps) |
| Cybersecurity | WSSE, account lockout, HTTPS, IP/MAC filtering, security logs, trusted upgrade/boot |
| Management Software / Browser | DMSS; NVR; DSS Pro; IE9+, Chrome 41+, Firefox 50+, Safari 10+ |
I/O Interfaces & Alarm (7 Inputs / 2 Outputs)
| Analog Output | 1 channel CVBS (BNC) |
|---|---|
| RS-485 | 1 (baud rate 1200–9600 bps) |
| Audio I/O | 1 channel LINE IN + 1 channel LINE OUT (bare wire) |
| Alarm Input / Output | 7 inputs (digital, 0–5 VDC) + 2 outputs |
| Alarm Linkage | Snapshot, preset, tour, pattern, recording, alarm output, email, audio |
| Alarm Event | Motion detection, video tampering, audio detection, network/IP conflict, SD card status, storage space |
Power, Environment & Protection
| Power Supply | 36 VDC; 2.23 A (±25%) OR PoE (802.3bt) |
|---|---|
| Power Consumption | Basic: 22 W; Max (illuminator + PTZ + heater on): 33 W |
| Power Output | Yes |
| Operating Temperature / Humidity | –40 °C to +70 °C (–40 °F to +158 °F) | ≤95% RH |
| Protection Ratings | IP67, IK10, NEMA 4X (supported), TVS 6000V lightning/surge/voltage transient protection |
| Anti-corrosion Level | Basic Protection – designed for general use, applicable in areas with no specific anti-corrosion requirements |
| Certifications | CE: EN55035, EN IEC61000-3-2, EN55032, EN60950, EN62368-1 |
Physical Structure
| Casing Material | Metal + plastic |
|---|---|
| Product Dimensions | 221.66 mm × 218.42 mm × 320.8 mm (8.73" × 8.60" × 12.63") (L×W×H) |
| Net Weight / Gross Weight | 4.96 kg (10.93 lb) / 8.21 kg (18.10 lb) |
| Power Adapter | Included |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 2141 reviews
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Product Reviews
★★★★★ 5
Nice functional printer at a low price-point
Style: WF-3820
At this price-point, the WF-3820 is a winner for a home printer with not much printing volume. It prints well. It was easy to set up the printer and wireless printing from a couple of computers. It uses ink cartridges. While Epson goes to great lengths to advertise/tout its cartridge-free printer models, if you don't print a lot this unit will do fine for you. Did I mention that it's relatively cheap? Has a fax function, but I don't have a landline anymore. It is a bit tall, and you have to open the scanner to access the ink cartridges; so beware if you're putting it in a cabinet or shelf without some decent head room.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
★★★★★ 5
Good Printer
Style: WF-3820
Given the 'not so good' reviews, I was a little apprehensive to buy this printer at first. This replaces a WF3620, in which I was very happy with its performance. But the print head began to print only Yellow and Black, and several attempts to 'unclog' the Cyan and Magenta nossles proved unsuccessful.
But, I am very happy with the WF3820 - both with the price and the performance. It is faster and the graphics are clear and sharp. The 'jury' is still out on how much toner it uses, but suspect it is around the same as with the WF3620. If so, then I will retain my 5 Star rating.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 7, 2023
★★★★★ 1
Good printer ... Until Epson bricked it with Firmware
Style: WF-3820
Bought this as a replacement for a small office HP that died on us. It is a good machine. Nice features at a reasonable cost. Good color, full duplex, excellent scanning, and reasonable speed. The drivers are fairly crappy in that they constantly want to update and are poorly written and appear to send too much data home. (max out two cores on a modern i7 for a tiny printer driver update.) Overall a good machine and excellent for the price. Epson ink is ridiculously priced so went with high quality refurbished ink cartridges. Worked great at a good price.
Fast forward to July 2022. Epson pushes firmware update for "performance, stability, and security updates" that seems harmless. Who doesn't install newer firmware when it is offered? After the firmware update the printer claimed that the ink cartridges were faulty and refused to function. Turns out that the printer is now a brick until I buy genuine Epson ink refills at an exorbitant price. Turns out the company has had a number of class actions against them in the past for this very shady practice. Time to write up some copy for social media and contact a lawyer. It should be illegal to remove capabilities from a product that has been bought and paid for and working for months. Certainly I will never buy another Epson product and neither will anyone at my company.
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Reviewed in the United States on July 18, 2022
★★★★★ 4
Good quality , almost perfect.
Style: WF-3820
I would give it a 5 star if it stayed connected. It can be temperamental at times connecting to the wifi. Once it's connected it works great. The app for the phone works flawlessly and it sends it relatively quick but if you have multiple pages to scan sometimes the printer freezes up. Causing a heartache and delay or needing to reset the printer. Overall it's a nice printer and compact in size .
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Reviewed in the United States on April 9, 2025
★★★★★ 5
Wifi works great.
Style: WF-3820
Printer works great, learning curve to getting the settup right. Printed some pictures so fare nice prints and a lot of setings to ajust to give you exactly what your looking for.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
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