NVR / Recorders › NVR504-16B / 32B
Uniview (UNV)NVR504-B Series · 4× SATA HDD
4-HDD Network Video Recorder · NVR504-B Series
NVR504-16 / 32B
16 / 32-channel network video recorder — four SATA bays with RAID 1/5, Ultra 265 compression, independent VGA and HDMI output, records cameras up to 16MP, with 320 Mbps incoming bandwidth and 16 alarm-in / 4 alarm-out terminals.
16MP · max recordingUltra 265 · low storage4× SATA · up to 24 TB eachRAID 1/5 · disk redundancy320 Mbps · incoming bandwidth38 languages · local interface
Choose your size — two models on this page
Rule of thumb: count your cameras across the whole site, then leave room to grow — 16 channels covers most single buildings; step up to the 32B if you're combining several buildings or expect to add cameras later. Highlighted rows in the spec table below show every difference between the two.
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How many terabytes for your channels and days? Use the storage calculator →
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The Uniview NVR504-B Series is a 4-HDD network video recorder offered in two sizes: NVR504-16B (16-ch) and NVR504-32B (32-ch). Both record cameras up to 16MP with Ultra 265 / H.265 / H.264 compression, output independently over HDMI (up to 4K) and VGA, and support RAID 1/5 disk redundancy across four SATA bays each up to 24 TB. The rear panel includes 16 alarm inputs, 4 alarm outputs, an RS485 port, and the local interface is available in 38 languages including Spanish (Latin America), Portuguese (Brazil) and French.
Is this the right recorder for you?
Plain-language guide for buyers and installers — based only on what this recorder actually does.
Large sites & multi-building campuses16 or 32 channels in one box covers a full warehouse, factory floor, or multi-story retail location without stacking multiple recorders.
Storage that can't afford to failFour SATA bays with RAID 1/5 mirror or parity-protect the footage — a single disk failure doesn't wipe out your recordings.
Long-term evidence retentionFour SATA bays, up to 24 TB each (up to 96 TB total), keep months of footage online instead of overwriting after a few weeks.
High camera counts on one network link320 Mbps incoming bandwidth over dual Gigabit ports handles 32 higher-resolution streams without choking the network.
Wired alarm integration16 alarm inputs and 4 alarm outputs on the rear panel wire directly to sirens, door sensors or access-control triggers — no extra alarm hub needed.
Local-language interface38 GUI languages including Spanish (Latin America), Portuguese (Brazil) and French — your customer operates it in their own language.
Search across many channels fastPaired with Uniview smart cameras, the built-in VCA Search (face snapshot, vehicle, human body, heat map, people counting) jumps straight to the clip instead of scrubbing hours of 16- or 32-channel footage.
Not the right pick if you need…
- PoE ports — cameras need a separate PoE switch (this recorder has no built-in PoE ports)
- Recorder-side AI on ordinary or third-party cameras — this series has no "Smart by NVR" processing; face/vehicle detection runs on Uniview smart IPC cameras upstream, the recorder only indexes and searches the results
- RS232 serial control — only RS485 is present on this series, RS232 is listed N/A
- A fifth hard disk or more — this series tops out at 4 SATA bays (up to 96 TB total with four 24 TB drives)
- Redundant/dual power input — it runs on a single DC 12 V/5 A power supply, no built-in PSU redundancy
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Key Features
Complete list from the official datasheet.
Support Ultra 265/H.265/H.264 video formats
16/32-channel input
VGA and HDMI independent output
Up to 16 Megapixels resolution recording
ANR technology to enhance the storage reliability when the network is disconnected
Support cloud upgrade
RAID-protected storage. Smart search built in.
Two real capabilities that define this series: RAID-protected 4-bay storage and VCA search working with smart cameras.
RAID 1/5 STORAGE
Four bays, and a disk can fail safely
Four independent SATA bays each take a disk up to 24 TB (up to 96 TB total) and support Disk Group plus RAID 1/5 — mirroring or parity protection so a single drive failure doesn't take your recordings with it.
SMART SEARCH
Built-in search, powered by smart cameras
Face Detection, Face Comparison and Vehicle Detection (LPR) on Uniview smart cameras feed the recorder's VCA Search — Face Snapshot Search, Motor/Non-Motor Vehicle Search, Human Body Search, People Counting Report and Heat Map — to narrow hours of 16- or 32-channel footage to the exact clip.
Which size fits your project?
Bars show camera capacity per model. Click the model buttons above to switch — the spec table highlights every other difference.
NVR504-16B16-ch input · live view split up to 16 · sync playback 16-ch
16cameras
NVR504-32B32-ch input · live view split up to 32 · sync playback 16-ch
32cameras
Who uses it, where it goes and how to size it
Written for the NVR504-16B / 32B from the official datasheet: 16 or 32 IP channels, a fixed 320 Mbps incoming bandwidth, 4 SATA bays up to 24 TB each with RAID 1/5, 16 alarm inputs / 4 outputs, no built-in PoE and no recorder-side AI.
Which size suits which installation
- NVR504-16B: one large building that needs long retention — 16 cameras with up to 96 TB of raw disk space: a warehouse, factory or hotel that must keep months of footage rather than weeks, with RAID 5 protection on four disks.
- NVR504-32B: campuses and multi-building sites — 32 channels on the full 320 Mbps, which leaves 10 Mbps per camera even with every channel used, so 4K cameras are realistic. Local synchronous playback is 16 channels.
- Sites with an existing Uniview smart-camera system — The recorder does not analyse video itself, but it indexes face, LPR and people-counting results from Uniview smart cameras and makes them searchable. A good fit when the AI is already in the cameras.
- Hot equipment rooms and alarm-heavy sites — Rated to 55 °C (the IQ version stops at 50 °C) and wired for 16 alarm inputs and 4 outputs, so door contacts, beams and sirens connect without a separate alarm hub.
Where and how to install the recorder
- 19-inch cabinet with the RM-1U-440 — The case is 440 × 344 × 48 mm, the width of a standard 19-inch rack. Mount it with the RM-1U-440 kit and leave the 1U above it empty or use a vented blank so four disks can breathe.
- Recorder to 55 °C, big disks to 40 °C — The recorder works from -10 °C to 55 °C, but the datasheet says the 24 TB per-disk maximum needs an ambient temperature of no more than 40 °C. In a non-air-conditioned room, plan smaller disks or add ventilation.
- 12 V / 5 A adapter on a UPS — Power is a DC 12 V / 5 A adapter; the recorder draws no more than 20 W without disks, and four spinning disks add to that. Run it and the camera PoE switches from a UPS: a power cut during a RAID 5 write can force a long array rebuild.
- Four identical surveillance disks, array first — For RAID 5 fit four disks of the same model and size, and create the array before recording starts, because building an array erases the disks. RAID 5 keeps the capacity of three disks; RAID 1 keeps half.
- Cameras through PoE switches — There are no PoE ports. Feed cameras from PoE switches (100 m maximum per copper run) and uplink the switches to one of the 2 gigabit RJ45 ports; 32 cameras at 320 Mbps in total still use only about a third of a gigabit link.
- Plan the alarm wiring — The 16 alarm inputs and 4 outputs sit on the rear panel. Label each zone at the terminal, keep alarm cables apart from mains power, and use RS485 for a serial PTZ or keyboard (there is no RS232).
Planning table: channels, bandwidth, disks and retention
Both sizes have the same 4-bay platform and a fixed 320 Mbps input, because there is no Smart On mode that halves it. The 32B doubles the channels and live split but keeps 16-channel local playback. With RAID 5 you lose one disk to parity; with RAID 1 you lose half.
| NVR504-16B · 16-ch | NVR504-32B · 32-ch | |
|---|---|---|
| IP camera channels | 16 | 32 |
| Incoming bandwidth | 320 Mbps | 320 Mbps |
| Average bitrate per camera with every channel in use | 20 Mbps | 10 Mbps |
| HDD bays × max capacity per disk | 4 × 24 TB | 4 × 24 TB |
| Usable storage: no RAID / RAID 5 / RAID 1 | 96 / 72 / 48 TB | 96 / 72 / 48 TB |
| Full-resolution decoding, H.265 / H.264 | 4 × 4K / 2 × 4K | 4 × 4K / 2 × 4K |
| Live view split, largest layout | 16 | 32 |
| Local synchronous playback | 16-ch | 16-ch |
| Retention, every channel at 4 Mbps, 96 TB without RAID | 138 days | 69 days |
| Retention, same cameras, 72 TB in RAID 5 | 104 days | 52 days |
- Pick the NVR504-16B for up to 16 cameras that must keep footage for months: at 4 Mbps each, RAID 5 on 4 × 24 TB still holds about 104 days.
- Pick the NVR504-32B for 17–32 cameras, including all-4K sites: 32 cameras at 8 Mbps use 256 of the 320 Mbps and fill 72 TB (RAID 5) in about 26 days.
- If you want the recorder itself to run face, SIP or UMD analysis on ordinary cameras, look at the NVR504-16B-IQ / 32B-IQ instead.
Assumptions: 4 Mbps per camera (typical continuous H.265 for 4 MP) and 8 Mbps for 4K. Days = TB × 10^12 ÷ (cameras × bitrate ÷ 8 × 86,400), rounded down; RAID 5 on four equal disks keeps three disks of capacity, RAID 1 keeps half. Formatted capacity is slightly lower than the label.
Full Specifications
Complete official specifications from the manufacturer's datasheet (technical values in English).
Highlighted rows differ between the two models:NVR504-16B · 16-chNVR504-32B · 32-ch
Decoding
| Decoding Format | Ultra 265, H.265, H.264 |
| Decoding Capability | 16B · Ultra 265/H.265: 2×16MP@30, 2×12MP@30, 4×4K@30, 6×5MP@30, 8×4MP@30, 10×3MP@30, 16×1080P@30 | H.264: 2×16MP(4800×2688)@30, 2×12MP@30, 2×4K@30, 4×5MP@30, 6×4MP@30, 8×3MP@30, 14×1080P@30, 16×720P@3032B · Ultra 265/H.265: 2×16MP@30, 2×12MP@30, 4×4K@30, 6×5MP@30, 8×4MP@30, 10×3MP@30, 16×1080P@30, 32×960P@25 | H.264: 2×16MP(4800×2688)@30, 2×12MP@30, 2×4K@30, 4×5MP@30, 6×4MP@30, 8×3MP@30, 14×1080P@30, 30×720P@30, 32×D1 |
| Decoding Capability Description | The resolution of each channel cannot exceed 8192 pixels in length and 4096 pixels in width. For VGA/HDMI independent output, the VGA live video is output by default; to output the highest resolution video from the HDMI port, clear the VGA video on the preview page. |
| Audio Compression | G.711A, G.711U |
Network
| Incoming Bandwidth | 320 Mbps |
| Outgoing Bandwidth | 160 Mbps |
| Remote Users | 128 |
| Protocols | TCP/IP, P2P, UPnP, NTP, DHCP, PPPoE, HTTP, HTTPS, DNS, DDNS, SNMP, SMTP, RTSP, 802.1x, IPv6, IPv4 |
| Browser (Plugin) | IE10, IE11, Chrome 45+, Edge 79+, Firefox 52+ |
Video/Audio Input
| IP Video Input | 16B · 16-ch32B · 32-ch |
| RCA Audio Input | 1-ch |
Video/Audio Output
| HDMI Output | 4K (3840 × 2160)/30 Hz, 1920 × 1080/60 Hz, 1920 × 1080/50 Hz, 1600 × 1200/60 Hz, 1280 × 1024/60 Hz, 1280 × 720/60 Hz, 1024 × 768/60 Hz |
| VGA Output | 1920 × 1080/60 Hz, 1920 × 1080/50 Hz, 1600 × 1200/60 Hz, 1280 × 1024/60 Hz, 1280 × 720/60 Hz, 1024 × 768/60 Hz |
| RCA Audio Output | 1-ch |
| Liveview Display | 16B · 1/4/6/8/9/1632B · 1/4/6/8/9/16/25/32 |
| Corridor Mode Screen | 16B · 3/4/5/7/9/10/12/1632B · 3/4/5/7/9/10/12/16/32 |
| Two-way Audio | 1-ch, RCA (Using the audio input and output) |
| Snapshot | FTP/Schedule/Event Snapshot; 4-ch snapshot (max. D1 (720 × 576) video resolution, with D1 snapshot resolution) |
Recording
| Recording Resolution | 16 MP/12 MP/8 MP/6 MP/5 MP/4 MP/3 MP/1080P/960P/720P/D1/2CIF/CIF |
| Synchronous Playback in Local | 16-ch |
Smart Function
| Smart by IPC | All channels (up to 8 images/s in total) Face Detection, Face Comparison, Vehicle Detection (LPR), Temperature Detection, SIP, UMD, Video Metadata, Traffic Monitoring |
| VCA Search | Face Snapshot Search, Face Comparison Search, Motor Vehicle Search, Non-Motor Vehicle Search, Human Body Search, General Search, People Counting Report, Heat Map |
Alarm
| General Alarm | Defocus Detection, Scene Change Detection, Object Left Behind, Object Removed, Auto Tracking, Motion Detection, Tampering, Human Body Detection, Video Loss, Alarm Input, Audio Detection |
| Alert Alarm | IP Conflict, Network Disconnected, Disk Offline, Disk Abnormal, Illegal Access, Hard Disk Space Low, Hard Disk Full, Recording/Snapshot Abnormal |
GUI Language
| GUI Language | 38 languages: Simplified Chinese, Traditional Chinese, English, Vietnamese, Thai, Turkish, Spanish (Latin America), Portuguese (Brazil), Spanish, Portuguese, French, German, Italian, Dutch, Polish, Czech, Hungarian, Slovak, Russian, Hebrew, Arabic, Ukrainian, Estonian, Bulgarian, Greek, Romanian, Danish, Swedish, Norwegian, Finnish, Croatian, Slovenia, Serbia, Korean, Japanese, Latvian, Lithuanian, Persian |
Hard Disk
| SATA | 4 SATA Interfaces |
| Capacity | Up to 24 TB for each HDD (the maximum HDD capacity varies with environment temperature and hard disk size; the environment temperature for use should not exceed 40°C) |
| Disk Group | Support |
| Redundant Storage | Support |
| Disk Array Type | RAID 1, 5 |
External Interface
| Network Interface | 2 RJ45 10 M/100 M/1000 M self-adaptive Ethernet Interface |
| USB | Front: 1 × USB2.0, Rear panel: 1 × USB2.0, 1 × USB3.0 |
| RS485 | 1 |
| RS232 | N/A |
| Alarm In | 16-ch |
| Alarm Out | 4-ch |
| Power Supply | DC 12 V/5 A |
| Power Switch | Support |
Working Environment
| Working Temperature | -10 °C to 55 °C (14 °F to 131 °F) |
| Working Humidity | ≤ 90% RH (non-condensing) |
| Power Consumption (without HDD) | ≤ 20 W |
Dimensions
| Weight (without HDD) | ≤ 3.4 kg (7.50 lb) |
| Dimensions | 440 mm × 344 mm × 48 mm (17.3" × 13.5" × 1.9") |
Certification
| Certification | CE; FCC; UL; RoHS; WEEE |
| CE | EN 55032, EN 61000-3-3, EN IEC 61000-3-2, EN 55035 |
| FCC | Part15 Subpart B |
Dimensions
Engineering drawing reproduced 1:1 from the official datasheet.
unit: mm (in.)
| Dimensions | 440 mm × 344 mm × 48 mm (17.3" × 13.5" × 1.9") |
| Weight (without HDD) | ≤ 3.4 kg (7.5 lb) |
| Power supply | DC 12 V / 5 A |
| Consumption (without HDD) | ≤ 20 W |
Rear panel — all interfaces
Optional Mounting Accessories
Order together with the camera to save shipping.
RM-1U-4404-HDD 1U NVR rack mount
16/32-Channel 4-Bay NVR FAQ — NVR504-B Series
How many IP cameras can I connect?
The NVR504-16B records 16 IP cameras and the 32B records 32, up to 16 MP per channel. Incoming bandwidth is 320 Mbps, so size camera bitrates to stay inside that figure, and pick the channel count that leaves room to add cameras as the site grows.
What happens if a hard drive fails?
The four SATA bays (up to 24 TB each, 96 TB total) support Disk Group, Redundant Storage and RAID 1 mirroring or RAID 5 parity. A single drive failure then doesn't stop recording or lose the protected footage — worth enabling on sites where video is evidence, such as shops, warehouses and residential compounds.
Can I connect alarm sensors and sirens?
Yes — it has 16 alarm inputs and 4 alarm outputs plus an RS485 port, so PIR sensors, door contacts or sirens wire directly to the recorder and can trigger recording, snapshots or notifications alongside the video events.
Does it support face detection and smart search?
Yes — with UNV smart cameras, every channel can report Face Detection, Face Comparison, Vehicle Detection (LPR) and Temperature Detection events (up to 8 images/s total). The NVR indexes these events for VCA Search — face snapshot/comparison, vehicle and human-body search — so you jump straight to the right clip instead of scrubbing hours of video.
Can I view live video remotely?
Yes — up to 128 remote users can connect. The recorder supports P2P, DDNS, HTTP/HTTPS and RTSP and works in a browser (IE10/11, Chrome 45+, Edge 79+, Firefox 52+), so an integrator can check several client sites from one office. Outgoing bandwidth for remote streams is 160 Mbps.
Will it run reliably in hot climates?
The rated working range is -10 °C to 55 °C at up to 90% non-condensing humidity, and the unit draws ≤ 20 W without drives. Give it ventilation and keep it out of direct sun inside equipment cabinets — standard practice for tropical installs.
Should I use RAID 5 or RAID 1 on the NVR504-32B, and how much space is left?
For most sites RAID 5 is the better balance: with four 24 TB disks you keep 72 TB and survive one disk failure, while RAID 1 keeps only 48 TB. With 32 cameras at 4 Mbps that is about 52 days on RAID 5 versus 34 days on RAID 1. Use four identical disks, and replace a failed one quickly, because a second failure during the rebuild loses the array.
Will the NVR504-16B record Hikvision, Dahua or other ONVIF cameras?
Third-party cameras are normally added with the ONVIF protocol (enable ONVIF and create an ONVIF user on the camera), but the datasheet does not list ONVIF, so send us the camera models to confirm before ordering. Expect recording and live view only: this model has no recorder-side AI, and its face, vehicle and people search work with results sent by Uniview smart cameras.
Can the NVR504-32B record 32 cameras in 4K?
Yes for recording: at a typical 8 Mbps per 4K camera, 32 cameras need 256 Mbps, inside the 320 Mbps input. For live viewing it decodes 4 × 4K at full resolution with H.265 but only 2 × 4K with H.264, so set the cameras to H.265 or Ultra 265 and let large splits use sub-streams. Storage is the real limit: 72 TB in RAID 5 holds about 26 days.
What is the difference between the NVR504-16B and the NVR504-16B-IQ?
The IQ version adds analysis inside the recorder (face, SIP, UMD and AcuSearch on ordinary cameras), but its input drops from 320 to 160 Mbps when Smart is on and it is rated to 50 °C. The NVR504-16B keeps the full 320 Mbps at all times, works to 55 °C, and relies on Uniview smart cameras for AI results. Choose the 16B when the cameras are already smart or you only need recording and alarms.
Can I keep footage from important cameras longer than the others on the NVR504-B?
Yes, it supports Disk Group: you can assign channels to different disks, for example the cash desk and gate cameras to one group and the rest to another, so busy cameras do not overwrite the important ones. Note that disk groups split the space rather than add to it, so size each group with the retention formula in the table above.
How many people can watch the NVR504-B remotely at the same time?
Up to 128 remote users can be logged in, but all remote viewing and playback share 160 Mbps of outgoing bandwidth: that is about 40 main streams at 4 Mbps or many more sub-streams at 1 Mbps. In practice the site's internet upload speed is usually the tighter limit, so set phones to use sub-streams for live view.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
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