Hikvision DS-2CD2046G2H-IU(4mm) 4MP AcuSense Mini Bullet with Microphone

Hikvision DS-2CD2046G2H-IU (4 mm) — 4 MP AcuSense mini bullet with microphone

This is the 4 mm version of Hikvision's compact G2H mini bullet: an F1.0 lens on a 4 MP sensor, AcuSense human and vehicle classification, a built-in microphone and 40 m of infrared, drawing just 7 watts.

F1.0 is the widest aperture Hikvision fit, and it is normally reserved for their ColorVu and DeepinView ranges. Here it sits in a Ø74.4 × 179.2 mm body weighing 525 g. The practical effect is 0.001 lux in colour — the camera holds colour further into dusk before the infrared takes over, which is exactly when a cheaper lens starts losing useful detail.

4 mm or 2.8 mm — which to order

Same camera, different lens. At 4 mm the field of view is 81.1° horizontal and the DORI figures are detect 78 m, observe 31 m, recognise 15 m, identify 7 m. At 2.8 mm the view opens to 100.2° but the figures fall to 63 m detect and 6 m identify.

Choose 4 mm where the camera looks along a length — a driveway, a side passage, a car park aisle. Choose 2.8 mm for breadth close in. The 4 mm holds focus from 2.5 m rather than 1.9 m, so it is the weaker choice mounted close to its subject.

Unlike most of this family, the illuminator and the optics are reasonably matched here: 40 m of IR against a 78 m detection range. Not perfect, but better balanced than the turrets in the same series, which pair 30 m IR with similar optics.

Seven watts

It runs on 802.3af Class 3 at a maximum of 7 W — among the lightest draws of any camera in the range. Sixteen of these need 112 W; sixteen of the strobe-and-siren deterrence bullets need 288 W. On a modest NVR with built-in PoE, that difference decides whether you can use every port.

What it has, and what it doesn't

The -IU suffix means a built-in microphone. There is no speaker, no strobe, and no alarm or audio terminal block — it listens, but it cannot speak back or trigger anything wired. For two-way audio look at the G3 audio bullets; for an on-camera siren, the IS2U/SL models.

Imaging

• 1/3" progressive scan CMOS, 2688 × 1520 at 25 fps (50 Hz)
• F1.0 aperture, 0.001 lux in colour, 0 lux with IR on
• 120 dB WDR for gateways and forecourts shot into strong backlight
• 40 m Smart Supplement Light IR at 850 nm
• 4 mm fixed lens on an M12 mount, depth of field from 2.5 m
• BLC, HLC and 3D DNR; 4 programmable polygon privacy masks

Recording, storage and network

• H.265+/H.265/H.264+/H.264, 32 Kbps to 8 Mbps
• microSD/SDHC/SDXC to 512 GB with ANR and card health detection, plus NAS (NFS, SMB/CIFS)
• ONVIF Profile S/T/G, ISAPI and SDK; iVMS-4200, Hik-Connect and HikCentral
• The Ethernet port is 10/100, not gigabit — ample at an 8 Mbps ceiling

Build and environment

• Metal front, body and bracket; IP67 to IEC 60529-2013
• −30 °C to 60 °C, humidity 95% or less non-condensing
• Ø74.4 mm × 179.2 mm, approx. 525 g

What you'll need with it

• An 802.3af (or better) PoE switch or NVR port, or a 12 VDC supply
• An AcuSense-capable Hikvision NVR to carry human/vehicle classification through to smart search on the recorder
• A microSD card for edge recording or ANR backfill — not supplied
• A pole or corner bracket if it is not mounting flat to a wall

Frequently asked questions

What does the F1.0 lens give me?

More light. It holds colour down to 0.001 lux, so the camera stays in colour later into dusk before switching to infrared.

Is the 4 mm better than the 2.8 mm?

Not better, different. It sees further with more detail over a narrower field. For close, wide coverage the 2.8 mm is the right choice, and the lens is fixed so it must be decided before ordering.

Does it have audio?

A built-in microphone, yes. No speaker and no audio terminals, so it listens but does not talk back.

How much PoE does it need?

Only 7 W on 802.3af — one of the lightest draws in the range, so it runs on almost any switch or NVR.

Trade pricing

Zenith Security Co is an authorised Hikvision partner. Prices shown are for trade account holders — contact us for account terms and stock availability.