Product overview
The Dahua DHI-LM24-B221 is a 23.8-inch Full HD IPS monitor with a maximum refresh rate listed at 144Hz. It is intended for general desktop use, multimedia and compatible gaming setups that can output Full HD at a high refresh rate. Its official display specification lists a 1920 × 1080 native resolution, 16:9 aspect ratio and IPS technology. Retail product names often round the screen size to 24 inches; Dahua’s technical specification gives 23.8 inches. The monitor has a stand, a narrow-bezel appearance and a black housing. Since Dahua publishes regional and revision-specific documents with some different values, confirm the specifications for the exact unit offered, especially if a particular contrast figure, power rating or blue-light implementation matters to your purchase.
Resolution, image and panel
The 1920 × 1080 panel provides a Full HD workspace suited to documents, browser tabs, streaming and everyday applications. Dahua lists an IPS panel with 178° horizontal and vertical viewing angles. IPS panels generally maintain a more consistent view across a wider seating area than many TN panels, although the actual image depends on the display settings, content and viewing position. Brightness is specified as 250 cd/m² typical. Dahua lists 16.7 million colors with 8-bit color depth and a 72% NTSC gamut on its V1 information. That gamut figure is not the same as a percentage of sRGB, and this specification alone does not establish professional color accuracy. The official documents list a pixel pitch around 0.2745mm and about 92.56 pixels per inch on the current V1 page. Use native resolution for the sharpest text and check the computer’s scaling settings if interface elements appear too small.
High refresh rate and motion terminology
Dahua lists a refresh rate up to 144Hz at 1920 × 1080. A higher refresh rate can show more display updates per second than a conventional 60Hz screen when the graphics source and connection deliver the corresponding signal. The display’s maximum does not guarantee that every game or computer will run at that rate; graphics performance, operating-system settings, input selection and cable capabilities also matter. The product page identifies a 1ms MPRT response time. MPRT and gray-to-gray response time describe different aspects of motion. Dahua’s reviewed official pages do not specify a separate GtG value for this product, so the 1ms claim should not be relabeled as 1ms GtG. Actual motion clarity can vary with refresh rate, image content and any motion-response settings. Buyers should choose the refresh mode supported by their source and compare behavior in the applications they use.
Ports and audio
The DHI-LM24-B221 is documented with one HDMI input, one DisplayPort input and one audio output. The newer Dahua V1 regional page identifies HDMI 2.0 and DisplayPort 1.4 and lists 1920 × 1080 at 144Hz for each. Check that the exact monitor revision and your cable/source combination support the desired signal. Connect a computer using its matching digital output; adapters may be needed when ports do not match, and adapter direction and bandwidth can limit the result. Dahua does not list built-in speakers. The audio output can be useful for routing sound from the monitor signal, but the official page reviewed does not explicitly name the connector format, so confirm the port on the unit if it is important. The Bangladesh product page and seller listings identify HDMI and DP; do not assume VGA, USB-C or a USB hub because they are not listed for this model.
Comfort features and their documentation
Dahua describes low-blue-light protection for the model. The Bangladesh product page calls the feature hardware-based, while the newer LM24-B221 V1 MENA product page calls it software blue-light protection. This discrepancy may reflect regional product revisions or updated documentation. It is safest to say that low-blue-light protection is listed and verify the implementation for the exact unit, rather than promising a specific hardware or software method without matching revision evidence. The screen surface is described as haze 25% and 3H on the V1 specifications. These surface figures concern finish and hardness; they do not substitute for a measured brightness or color-accuracy claim. A comfortable setup also depends on room light, display brightness, screen distance and taking regular breaks. No medical outcome is implied by the manufacturer feature.
Stand, mount and physical details
The included stand supports tilt from −5° ±2° to +15° ±2° in the Dahua specification. Height adjustment, swivel and pivot are marked unavailable in the official Bangladesh page and are not listed as supplied stand features in the V1 documentation. The monitor supports a 75 × 75mm VESA mount, so a compatible arm or wall bracket may be used. Check mounting hardware and load limits and follow the product manual during installation. Dahua lists a net weight of 2.82kg and gross package weight of 3.84kg. Its current V1 MENA page gives dimensions of 539.2 × 320.4 × 39.1mm without the wall-mount bracket; the Bangladesh page lists a 41.3mm depth for the display without the base. These dimensions differ by regional document and revision. Allow additional space for the stand, cables and ventilation, and use the unit’s own label or manual when precise clearance is required.
Power and regional specification differences
Dahua specifies an external power supply rated at 12V DC, 2.5A. That is the monitor-side adapter output and should not be confused with the AC mains voltage printed on an adapter input label. The Bangladesh page lists consumption at up to 30W and standby at up to 0.5W. The newer V1 MENA page instead lists 18W basic, 19W typical and 21W maximum, with less than 0.5W standby. The two official sources therefore do not support one universal power-consumption number for every regional revision. For this catalog, the discrepancy is disclosed and the exact adapter and product revision should be checked before relying on a particular consumption figure. Do not estimate electricity cost from the input-current rating alone; actual energy use depends on the unit and operating conditions.
Contrast values and what to verify
The Dahua Bangladesh page and the official 2025 datasheet state a 1500:1 contrast ratio. Dahua’s newer V1 MENA page states 1200:1. Because both sources are manufacturer-published and identify this model family, this review does not present one value as universal. The catalog attribute records both figures with source and version context. When comparing the monitor, ask the seller for the exact revision or use the documentation tied to the serial number. Contrast is only one part of picture quality; brightness, room lighting, image mode and panel variation also affect what a user sees. This approach avoids combining figures from different documents as though they were measured on the same production revision.
Local warranty and purchase checks
Bangladesh retailers commonly list a three-year warranty for this model. That is local seller information and does not by itself prove that every Dahua unit has identical warranty coverage. Confirm whether the seller or an authorized local service channel provides support, which parts are covered, what exclusions apply and which documents are needed for a claim. Keep the invoice and verify the product label shows DHI-LM24-B221. Check the box contents: Dahua documentation lists an adapter, stand/base and HDMI cable for the relevant regional package, but accessories can vary by market. If you want to use 144Hz, verify the port, cable and computer output before purchase. No current offer, inventory status or customer rating is asserted in this description.
Who should consider it
This monitor may fit a user who wants a compact 23.8-inch IPS display with Full HD resolution and a high refresh-rate option for compatible games or smooth desktop movement. HDMI and DisplayPort inputs offer digital connection choices, and the VESA pattern supports mounting flexibility. It may not suit someone who needs a larger or higher-resolution screen, integrated speakers, USB-C docking, height-adjustable stand or a specific verified contrast/power version without confirming the exact SKU revision. Color-critical professionals should review gamut and calibration requirements separately; the listed 72% NTSC figure is not a calibration report. For shared desks, the IPS viewing angles can be helpful, while the 250-nit typical brightness should be compared with the lighting in the intended room. Matching the monitor to the computer’s ports and expected refresh mode is the most useful pre-purchase check.
Technical specifications
Key features
- 23.8-inch viewable IPS display with Full HD 1920 × 1080 resolution and 16:9 aspect ratio.
- Up to 144Hz refresh rate at native resolution when the source device, selected input and cable support that mode.
- HDMI 2.0 and DisplayPort 1.4 inputs; Dahua V1 documentation lists 1920 × 1080 at 144Hz on both.
- 1ms MPRT motion-response figure; it is not a gray-to-gray response time.
- 250 cd/m² typical brightness and 16.7 million color (8-bit) support.
- 178° horizontal and vertical viewing angles, IPS panel, and 72% NTSC listed on the V1 specification.
- One audio output connector; no built-in speaker is listed.
- Tilt adjustment from −5° to +15° with stated tolerance; 75 × 75mm VESA mounting.
- External 12V DC, 2.5A power adapter; official regional documents differ on consumption figures.
- Low-blue-light protection is listed; Dahua documents differ on hardware versus software implementation by regional/version page.
Advantages
- FHD resolution and a 144Hz maximum refresh rate give this compact IPS display a useful balance for general computing and supported games.
- IPS technology and wide 178°/178° viewing-angle figures suit shared viewing better than a narrow-angle TN panel.
- HDMI and DisplayPort provide two digital input choices, with official V1 documentation specifying 144Hz at Full HD on both.
- The 75 × 75mm VESA pattern and tilt adjustment allow desk-stand placement or a compatible mount.
- Dahua lists 250 nits typical brightness and 8-bit, 16.7-million-color support for everyday content.
Things to consider
- 1ms is MPRT; the manufacturer documentation reviewed does not provide a separate gray-to-gray response figure.
- Contrast is inconsistent across official documents: the Bangladesh page/2025 sheet say 1500:1, while the newer V1 MENA page says 1200:1. Confirm the regional revision.
- Low-blue-light implementation is likewise described as hardware-based by Dahua Bangladesh and software protection by the V1 MENA page.
- No built-in speakers are listed; an audio output is provided but the official page does not specify its exact connector type.
- The supplied stand offers tilt only; height, swivel and pivot adjustment are not listed.
- Dahua’s published power figures differ by document and region, so the exact unit’s adapter and consumption specification should be checked.
Frequently asked questions
What is the screen size of the DHI-LM24-B221?
Dahua specifies a 23.8-inch screen. Retail titles sometimes round this to 24 inches; the official diagonal is 23.8 inches.
What resolution does it support?
The native resolution is Full HD 1920 × 1080 with a 16:9 aspect ratio.
Does it support 144Hz?
Dahua lists up to 144Hz at 1920 × 1080. The computer, graphics output, selected HDMI/DisplayPort input, cable and refresh setting must all support that mode.
What does 1ms response time mean?
The manufacturer labels the 1ms figure MPRT, a motion-picture-response-time measure. It is not a stated gray-to-gray response time.
Which panel technology does it use?
It uses an IPS LCD panel with LED/ELED backlighting. Dahua lists 178° horizontal and vertical viewing angles.
What ports are available?
The model has one HDMI input, one DisplayPort input and an audio output. Dahua’s V1 page identifies HDMI 2.0 and DisplayPort 1.4; exact regional product revisions should be checked.
Does the monitor have built-in speakers?
No built-in speakers are listed in the Dahua specifications reviewed. It has an audio output, whose exact connector type is not specified on the official page.
What is its contrast ratio?
The Dahua Bangladesh page and 2025 sheet list 1500:1; the newer LM24-B221 V1 MENA page lists 1200:1. Because the official values conflict, confirm the specification for the unit’s regional revision.
Does it include low-blue-light protection?
Yes, Dahua lists low-blue-light protection. Its Bangladesh page describes hardware-based protection, while its newer V1 MENA page calls it software protection, so implementation depends on the version documentation.
Can it be mounted on an arm?
Dahua lists a 75 × 75mm VESA pattern. Verify that the mount supports this pattern and the monitor’s weight before installation.
What are the tilt and stand adjustments?
The listed tilt is −5° ±2° to +15° ±2°. Height adjustment, swivel and pivot are not listed for the standard stand.
What warranty applies in Bangladesh?
Bangladesh sellers list three years, but the precise provider and coverage may vary. Confirm the written terms, invoice and service route for the exact unit before buying.
Specifications are based on Dahua documentation for this model. Manufacturer documents differ by regional and product revision; verify the exact unit and local warranty terms with the seller.
