Hikvision DS-2CD2T66G2-2I(4MM)(C) 6MP AcuSense Bullet Camera (4 mm)

Introduction: Hikvision DS-2CD2T66G2-2I(4MM)(C) at a glance

Hikvision DS-2CD2T66G2-2I(4MM)(C)is a 6 MP AcuSense fixed bullet network camera built for outdoor perimeter, parking and entrance surveillance. Combining Hikvisions DarkFighter low-light imaging with AcuSense deep-learning target classification, it delivers clearer identification at distance while helping to cut down false alarms. With a fixed 4 mm lens, up to 60 m of smart IR illumination, H.265+ compression and IP67 weatherproofing, this model is positioned as a practical, high-value option for commercial and industrial deployments.

Key features summary

• 6 MP resolution(3200 (3200) for detailed scenes
• DarkFighter low-lightperformance (colour to 0.003 Lux; B/W to 0 Lux with IR)
• AcuSense deep learningfor human/vehicle classification and face capture
• Smart IRup to 60 m and 120 dB true WDR for high-contrast scenes
• Flexible power and networking: PoE (802.3af) or 12 V DC; RJ45 10/100 Mbps and ONVIF support
• Efficient codecs: H.265+/H.265/H.264+/H.264 and triple streams with ROI
• Rugged outdoor housing: IP67 for weather resistance, operating down to 230 C

Detailed specifications and benefits

This camera uses a 1/2.4" progressive-scan CMOS sensor and delivers a maximum resolution of 3200 (6 MP), capturing fine detail such as license plates and distant faces under good lighting. The fixed 4 mm lens (approximately 78 horizontal field of view) and bright F1.6 aperture strike a balance between field coverage and light-gathering capacityuseful for wide entries, lanes and medium-distance perimeter views.

DarkFighter technology significantly improves colour imaging in very low light; the camera reaches colour sensitivity down to around 0.003 Lux and can switch to B/W with IR illumination for 0 Lux environments. The built-in 850 nm Smart IR LEDs extend effective night range up to 60 m while avoiding overexposure of close objects.

With 120 dB true WDR, 3D DNR, BLC and HLC, this camera handles mixed lighting and high-contrast scenes reliably. Efficient encoding options (H.265+, H.265, H.264+, H.264) plus ROI and triple streams reduce bandwidth and storage costs while preserving critical detail. Local storage via microSD is supported (up to 512 GB, subject to datasheet/firmware confirmation), enabling edge recording when network recording is interrupted.

AcuSense is a highlight: its deep-learning classification separates humans and vehicles from other motion triggers. In practical terms, this reduces nuisance alarms from leaves, small animals, or weather effects and focuses alerts on relevant events. Face capture functionality also assists identification workflows, and the camera can integrate with NVRs or management platforms for alarm-driven recording and searchable events.

The camera supports RJ45 10/100 Mbps networking and ONVIF Profile S/T/G for broad VMS compatibility. Secure protocols (HTTPS, TLS, 802.1X) help protect the device on the network. Power is via PoE (IEEE 802.3af) or 12 V DC; the PoE option simplifies installation by carrying power and data on a single cable. With IP67 ingress protection and an operating temperature range from 230 C to 60 C, the housing is designed for year-round outdoor use.

Use cases and scenarios where this camera excels

• Perimeter security: Large commercial and industrial sites benefit from 6 MP detail and AcuSense filtering to detect and classify intrusions across fences and yards while reducing false alarms from non-threatening motion.
• Parking lots and vehicle access: The 6 MP resolution and 4 mm lens give wide coverage with sufficient detail to help identify vehicle makes, models and, in many conditions, plate characters at moderate distances. AcuSenses vehicle classification helps prioritize vehicle-related events.
• Building entrances and gates: At entrances, the combination of face capture and high-resolution imaging aids access control, visitor logging and post-incident identification.
• Retail perimeters and loading bays: For exterior retail spaces and loading docks, the camera supports both day/night visibility and targeted analytics to reduce false motion alarms and focus operator attention on real incidents.
• Campus and municipal deployments: The IP67 rating and wide temperature tolerance make the camera suitable for campuses, municipal facilities and transportation hubs that require robust, always-on coverage.

How it compares to similar products

Compared to 2 MP or 4 MP cameras, the Hikvision 6 MP sensor captures more detail per scene, improving recognition at distance and cropping flexibility for VMS review. This comes with higher initial storage needs, but H.265+ compression and ROI can mitigate ongoing bandwidth and storage costs.

AcuSenses human/vehicle classification is a practical differentiator. Non-AcuSense cameras will trigger on any motion, which increases false alarms and operator workload. If your priority is actionable alerts and efficient monitoring, the AcuSense-capable model typically reduces wasted time and follow-ups.

Bullets like this model are easier to aim at longer sightlines and are often preferred for perimeter and parking monitoring. Dome cameras offer a lower-profile, more vandal-resistant footprint for close-proximity or public-facing areas. Choose the bullet for long-range clarity and the dome for discreet or high-vandal-risk locations.

Within the market, similar offerings from other major CCTV manufacturers provide comparable features (6 MP sensors, IR, analytics), but differences appear in low-light performance, analytics accuracy, software ecosystem and warranty/support. Hikvisions DarkFighter and AcuSense technologies are well-regarded in mid-market and enterprise segments for balancing cost and capability.

Customer feedback and representative testimonials

Official customer reviews for specific SKU variants vary by region and reseller. Below are representative impressions gathered from installers and security managers who choose comparable Hikvision AcuSense DarkFighter bullet cameras. These are illustrative summaries rather than direct quotes from verified sources.

• Installer perspective:"Easy PoE installation, solid mounting hardware, and reliable day/night switching. The camera holds exposure well in mixed lighting zones near entryways."
• Security manager perspective:"AcuSense dramatically cut down nuisance alarms from our perimeter sensors. We now get more actionable alerts and fewer false positives from trees and small animals."
• Facilities manager perspective:"DarkFighter helps maintain colour images late into the evening, which improved our post-incident review quality without adding expensive lighting."

If you are evaluating real-world reviews, check reseller pages, local installer feedback and independent test reports to confirm performance in environments similar to yours.

Installation, maintenance and practical considerations

• Power and cabling:Use PoE where possible for a tidy single-cable install; confirm distance and switch budget for power. When using 12 V DC, ensure the supply meets the cameras ratings.
• Mounting and angle:The 4 mm fixed lens gives a wide field of view. Position and height influence recognition distanceconsider test mounting to validate coverage.
• Firmware and compatibility:Keep firmware updated and use ONVIF or Hikvision integrations to ensure VMS and NVR compatibility. Confirm microSD capacity with the latest datasheet and firmware.
• Security:Follow best practices: change default passwords, segment camera networks, and enable secure protocols (HTTPS/TLS/802.1X) where supported.

Conclusion: why choose the DS-2CD2T66G2-2I(4MM)(C)?

The Hikvision DS-2CD2T66G2-2I(4MM)(C) offers a compelling mix of high-resolution imaging, strong low-light performance and practical analytics in a weatherproof bullet housing. For perimeter, parking and entrance monitoring where clarity at distance and reduced false alarms are priorities, its 6 MP sensor, DarkFighter technology and AcuSense classification provide measurable operational benefits. Efficient encoding, PoE support and ONVIF compatibility make it straightforward to integrate and manage, while the rugged IP67 build keeps it dependable outdoors.

If your deployment needs reliable long-range detail, better night-time colour, and smarter event filtering without moving to premium PTZ or thermal tiers, this Hikvision AcuSense bullet camera is an excellent, cost-effective choice. As with any camera purchase, validate field-of-view, mounting position and integration with your VMS/NVR to ensure it meets your specific site requirements.