Introduction: Meet the Hikvision DS-2CD2166G2H-ISU — Smart, low-light 6MP dome
The Hikvision DS-2CD2166G2H-ISU is a 6 MP AcuSense fixed dome network camera designed for demanding indoor and outdoor surveillance applications. Combining a high-resolution 3200 × 1800 sensor, Hikvision's DarkFighter low-light technology, AcuSense deep-learning classification (human/vehicle) and a rugged IP67/IK10 enclosure, this model targets installations that require clear image detail, reliable detection and flexible audio/network features. The ISU variant adds an onboard microphone, two-way audio I/O and alarm I/O, plus PoE and microSD storage for standalone recording.
Key features at a glance
- 6 MP resolution:3200 × 1800 progressive scan CMOS for crisp image detail.
- DarkFighter low-light:excellent colour sensitivity down to 0.001 lux and 0 lux with IR.
- AcuSense intelligent detection:deep-learning human/vehicle classification to reduce false alarms.
- Wide dynamic range:120 dB true WDR for scenes with strong contrast.
- Built-in audio & I/O (ISU):onboard microphone, two-way audio I/O and alarm inputs/outputs.
- Flexible recording:microSD up to 512 GB plus NAS support and ANR; H.265/H.265+ compression.
- Rugged design:IP67 and IK10 rated for outdoor durability; PoE (IEEE 802.3af) or 12 VDC power.
Detailed specifications and benefits
The DS-2CD2166G2H-ISU packs a broad set of technical capabilities that translate into practical benefits on-site. Below is a distilled view of the core specifications and what they mean for everyday use.
- Sensor:1/2.4" progressive scan CMOS delivering 3200 × 1800 pixels (6 MP). Higher pixel count enables clearer identification of faces, license plates and fine scene details compared to 2 MP or 4 MP cameras.
- Lens & field of view:Fixed 2.8 mm, F1.0 with a wide horizontal FOV of ~114.8° (diagonal 143.5°). This wide-angle view is ideal for covering broad areas such as retail floors, parking bays and building approaches without needing multiple cameras.
- Low-light performance (DarkFighter):Colour sensitivity to 0.001 lux means usable colour images in very low ambient light; combined with IR up to ~30 m, the camera maintains recognition capability across day/night conditions.
- True WDR (120 dB):Handles scenes with both bright and dark zones (for example, building entrances with sunlit backgrounds) and preserves important detail across the dynamic range.
- Compression:Supports H.265, H.265+ and H.264, reducing bandwidth and storage needs without sacrificing image quality. Bit rates range from 32 Kbps to 16 Mbps depending on scene complexity and encoding settings.
- Frame rate:Up to 25 fps at full 6 MP resolution (50 Hz regions), offering smooth motion capture for most surveillance needs.
- Smart detection (AcuSense):Onboard deep-learning algorithms classify targets as human or vehicle and support perimeter protection rules. This significantly reduces false positives from leaves, shadows or small animals, saving time for operators and reducing unnecessary alerts.
- Audio:The ISU variant includes a built-in microphone plus audio input/output for two-way voice communication. Supported codecs (G.711, G.722.1, AAC-LC, MP3) ensure compatibility with common NVRs and VMS platforms.
- Storage:microSD up to 512 GB for local recording and ANR support to avoid data loss during network outages; NAS support (NFS/SMB) gives flexible recording architectures.
- Network & protocols:ONVIF Profile S/G/T ensures interoperability with third-party recorders and management systems. Standard network features such as HTTPS, RTSP and IPv6 are supported for secure connections.
- Power:PoE (IEEE 802.3af, Class 3) simplifies installation by carrying data and power over a single cable, or use 12 VDC where PoE is not available. Maximum power draw is modest (~9.5 W PoE).
- Environmental ratings:Rated to operate from −30 °C to 60 °C and up to 95% humidity (non-condensing), with IP67 ingress protection and IK10 impact resistance for outdoor and public-space deployments.
- Dimensions & weight:Compact dome form factor (Ø121.5 mm × 97.6 mm, ~525 g) for unobtrusive mounting on ceilings, soffits or walls.
Where the DS-2CD2166G2H-ISU excels — use cases and scenarios
This camera is engineered for scenarios that demand a combination of high image fidelity, robust analytics and environmental resilience. Typical use cases include:
With IP67 weatherproofing, IK10 vandal resistance and DarkFighter low-light capability paired with IR illumination, the camera is well-suited to monitor building perimeters, entrances and walkways day and night. AcuSense reduces nuisance alerts from wildlife or moving vegetation, enabling focused alerts on people and vehicles.
The wide field of view and vehicle classification make the camera a practical choice for parking areas where you need vehicle detection, license plate context (depending on distance and resolution) and reliable behaviour analytics during low-light hours.
Retailers benefit from the camera's 6 MP resolution for shelf and aisle coverage, DarkFighter performance for dimly lit shop floors, and two-way audio for loss-prevention or customer assistance scenarios.
For branch offices or smaller sites where a single camera may need to provide both situational awareness and evidence-grade imagery, onboard microSD recording, PoE convenience and integrated alarm I/O deliver flexible deployment options without heavy infrastructure.
Comparisons with similar products on the market
When choosing a dome camera, buyers typically weigh resolution, low-light performance, analytics and durability. The DS-2CD2166G2H-ISU positions itself strongly across these dimensions, but it's useful to compare it with common alternatives.
Compared to generic fixed dome cameras without deep-learning analytics, the AcuSense-equipped camera offers a tangible operational advantage: fewer false alarms and more actionable alerts. For environments plagued by motion noise (trees, weather, animals), the AcuSense classification can reduce the workload on security teams and improve response accuracy.
6 MP is a balanced choice between 4 MP and 8 MP (4K) options. It provides noticeably more detail than 4 MP while avoiding some of the higher bandwidth and processing overhead of 4K. For many surveillance scenarios—entrances, aisles, small parking lots—6 MP is a practical compromise offering improved identification without excessive storage requirements.
Hikvision's feature set—DarkFighter for low-light, AcuSense analytics and broad ONVIF support—compares favorably with offerings from other mainstream manufacturers. Competing brands may match or exceed in specific areas (for example, some offer higher-end sensors or different analytics ecosystems), so selection should consider integration with existing NVR/VMS, preferred codec performance and local support. In deployments that already rely on Hikvision hardware or software, the DS-2CD2166G2H-ISU integrates seamlessly and provides a consistent feature set.
Customer feedback and installer impressions
While individual experiences vary by environment and configuration, aggregated feedback from installers and end-users of similar Hikvision AcuSense dome models highlights several recurring points:
- Installers appreciate the compact form factor and PoE power for straightforward, quick deployments without additional power wiring.
- Security operators often report fewer false alarms after enabling AcuSense rules, which improves the signal-to-noise ratio for perimeter alerts.
- End-users value the low-light colour imaging from DarkFighter in locations where street lighting is minimal, noting clearer identification in early morning or late evening hours.
- Some integrators recommend careful configuration of sensitivity and detection zones to ensure the best balance between missed events and unnecessary alerts.
Note: There is no factory warranty detail included here—check the seller or Hikvision datasheet for local warranty terms and compliance declarations.
Installation tips and compliance
For optimal performance, position the camera to take advantage of its wide field of view while avoiding direct pointing at intense light sources to maximize WDR effectiveness. Use PoE switches that support IEEE 802.3af or proper 12 VDC supplies when PoE is not available. Configure AcuSense detection rules, privacy masks and recording schedules in the recorder or camera interface to match the site's operational needs. Follow the official Hikvision datasheet and local electrical/networking codes for safe and compliant installation.
Conclusion: Why choose the DS-2CD2166G2H-ISU?
The Hikvision DS-2CD2166G2H-ISU is a well-rounded fixed dome camera that blends high-resolution imaging, strong low-light capability and intelligent analytics in a weatherproof, impact-resistant package. Its AcuSense human/vehicle classification reduces false alerts and focuses attention where it matters most, while onboard audio and flexible storage options increase deployment versatility. For organizations seeking a reliable, easy-to-integrate camera for perimeter, parking, retail or general-purpose surveillance, this model offers a compelling balance of performance, durability and operational efficiency.
Suggested retail price:USD 169.99 (check local suppliers for current pricing and availability).
For final specification confirmation, compliance and warranty details, consult the official Hikvision datasheet and the vendor from whom you purchase the equipment.
