Product overview
Dahua DHI-LM27-B221S is a 27-inch Full HD monitor built around an IPS LCD panel with an ELED backlight. Dahua positions it in its commercial monitor range, while local Bangladesh stores also describe it as a gaming monitor because the exact datasheet specifies 144Hz refresh and 1ms MPRT. Those labels describe different uses of the same display: the manufacturer’s category is commercial, and the refresh specification can appeal to gaming users. The full model suffix is important. This page is for B221S; DHI-LM27-B221 and DHI-LM27-B221B are separate catalog identities and may use different brightness, contrast, power, panel, stand or mounting details. The guide follows the Dahua B221S datasheet where retailer specifications disagree. Current BiponiBD offer price, available stock, shipping charge and the seller’s warranty provider must be checked on the live offer because they can change independently of manufacturer specifications.
Screen size, aspect ratio and Full HD resolution
The screen measures 27 inches diagonally and uses a 16:9 aspect ratio. Native resolution is 1920 × 1080 pixels, commonly called Full HD or FHD. This format is broadly supported by desktop computers, laptops, game consoles and streaming devices. A 27-inch FHD panel provides a large viewing area for general office work, web browsing, documents, video and gaming, while the source device can often render FHD more easily than a higher-resolution mode. Resolution density is a trade-off: at this size, text and fine interface details are less dense than on a 27-inch QHD display. Users who sit very close, work with tiny text, retouch detailed images or need more workspace may prefer to compare a higher-resolution alternative. Adjust text scaling and viewing distance to suit the desk rather than assuming the screen will look identical to a smaller FHD monitor.
IPS panel and viewing angles
Dahua identifies the B221S as an IPS LCD display with ELED backlight. Its stated viewing angle is 178 degrees horizontally and vertically. IPS panels are commonly chosen where viewers may move around the screen or where more than one person looks at the display, since the image is intended to remain usable across a broad angle. The listed viewing angle is a technical measure and does not mean brightness, contrast and color remain perfectly unchanged at every position. The sheet also lists a 597.888 × 336.312 mm viewing area, 0.3114 mm pixel pitch and 81.59 pixels per inch. These dimensions help distinguish the active display from the full exterior chassis. The supplied BiponiBD images show the front and angled front with a sample mountain image, plus a rear view of the casing and stand; they do not show the serial label, port close-up, carton or accessories.
144Hz refresh rate and compatibility
The exact manufacturer specification lists a 144Hz refresh rate. A display refreshing at 144Hz can update the image more frequently than a 60Hz model, which may make cursor movement, scrolling and fast game motion look smoother when the source provides compatible frame rates. The benefit depends on the graphics device, application, connection, cable, operating system and selected display mode. Dahua specifically lists one HDMI 2.0 input and one DisplayPort 1.4 input and states that each supports 1920 × 1080 at 144Hz. This model-specific information is more useful than generic claims that an unspecified HDMI port supports a particular mode. After connecting the computer, open the operating system’s advanced display settings and confirm the refresh rate. Some devices initially select 60Hz, and some adapters, docks, cables or console modes can limit the available options.
Understanding the 1ms MPRT rating
The datasheet lists response time as MPRT 1ms. MPRT means moving-picture response time and is not the same specification as gray-to-gray pixel transition time. It also does not measure controller-to-screen input lag or promise that every image transition takes precisely one millisecond. MPRT values can be associated with motion-clarity modes and depend on measurement conditions; Dahua’s exact sheet does not provide a separate GTG figure or input-lag result. When comparing monitors, compare MPRT with MPRT and GTG with GTG, and check which display mode was used for the claimed number. A 144Hz refresh rate, frame rate consistency, overdrive settings, image content and connection all affect perceived motion. The updated title and FAQ keep the MPRT qualifier beside 1ms so buyers are not led to read the number as an unqualified pixel-transition claim.
Brightness, contrast and color
Dahua specifies typical brightness of 250 cd/m², which is also commonly written as 250 nits. Its static contrast ratio is 1200:1. It lists 16.7 million display colors and a color gamut of 72% NTSC. These are the exact-model values used in the catalog. Some Bangladesh retailer pages show 300 nits and 1500:1, but those figures conflict with the manufacturer’s DHI-LM27-B221S datasheet and may have been copied from another monitor or listing. The official figures do not establish color accuracy, factory calibration, HDR certification or suitability for color-critical print and grading work. A buyer who relies on precise color should look for measurement data for this exact unit and confirm the desired gamut and calibration process. In a normal room, perceived brightness and contrast also depend on the ambient light, chosen picture settings and the display sample itself.
Video inputs, audio output and built-in speakers
The B221S datasheet identifies one HDMI 2.0 video input and one DisplayPort 1.4 input. Each is listed for 1920 × 1080 at 144Hz. It also lists one audio-out connector. Unlike the non-S DHI-LM27-B221, which is specified without speakers, the B221S exact-model sheet lists built-in stereo speakers rated at 2 × 1W. This is a key model distinction and resolves the mixed retail summaries. Small integrated monitor speakers can handle basic system sounds and casual viewing, but the manufacturer does not publish measured loudness or sound quality; external speakers or headphones may be better for music, films or a shared room. Confirm the source device routes audio over HDMI or DisplayPort when using the internal speakers, and use the audio output when connecting external equipment. The datasheet’s included-cable statement describes the standard package, not a verified BiponiBD shipment.
Software blue-light protection and everyday comfort
Dahua lists software blue-light protection for this exact model. Software-based protection changes the displayed image, often by reducing short-wavelength blue light or warming the color balance. It may be useful for people who prefer a warmer image in the evening, but it is not a medical feature, a promise to prevent eye strain, or a replacement for comfortable room lighting and breaks. Color-sensitive work may require turning the mode off or restoring a calibrated profile. The sheet does not describe a hardware low-blue-light filter, so the public specification uses the manufacturer’s software wording. For day-to-day comfort, also adjust brightness to the room, place the screen to limit reflections, choose readable text scaling, and set a viewing distance that works for the user. The 178-degree viewing-angle figure describes panel viewing behavior and should not be treated as a health or ergonomic claim.
Stand, tilt and VESA installation
The manufacturer lists a tilt range from −5 degrees to +15 degrees. Height adjustment, swivel and pivot are not specified in the exact sheet. The included stand is visible in the first two gallery images and supports the panel on a compact base, but the photos cannot prove movement beyond the published tilt range. A 75 × 75 mm VESA mounting pattern is listed for compatible monitor arms or wall brackets. Check the arm’s mounting plate and load rating, screw length and rear clearance before installation. Do not assume that the B221S shares the 100 × 100 mm mount used by some neighboring Dahua models. When choosing an arm, use the 3.84 kg net monitor figure as a starting point and account for the arm’s own requirements; do not use the 5.29 kg packaged weight as the bare display load. Follow Dahua’s mounting instructions and support the screen during installation.
Physical dimensions, weight and shipping carton
Dahua lists the monitor body, without wall-mount bracket, at 614.1 mm wide, 363.0 mm high and 45.1 mm deep. The net weight is 3.84 kg. The package measures 694 × 458 × 114 mm in width, height and depth and has a gross weight of 5.29 kg. Product dimensions and shipping dimensions answer different questions: the first helps determine desk fit or mount clearance, while the latter describes the packed carton for handling and courier planning. The back image shows the rear casing and central stand attachment but not a measuring reference. Always leave room for the stand footprint, attached cables, airflow and comfortable viewing distance. The catalog variant logistics fields are populated from the manufacturer’s published package measurements; verify the actual courier dimensions for the physical carton if exact freight calculation is required.
Power requirements and consumption
The B221S uses a 12V DC, 3A power adapter. Dahua lists power consumption as 21W basic, 27W typical and 29W maximum, with standby consumption below 0.5W. Use the supplied compatible adapter or follow official service guidance; matching only the voltage is not sufficient when selecting a replacement, since current capacity, polarity and connector must also match. The datasheet describes the display’s adapter output but does not establish which exact regional mains plug or cable will be included in a local shipment. Check the adapter label and seller package for local compatibility. The figures are manufacturer specifications and are not a promise of an individual household electricity bill, which varies with operating hours, brightness and usage. Avoid using an adapter based only on a similar-looking connector.
Accessories, package and warranty
Dahua’s standard accessory list mentions a power adapter, base, HDMI cable, user manual QR code and legal/regulatory information. It also lists a wall mount as an optional accessory. Standard package lists can vary by regional distribution and do not confirm the contents of a particular BiponiBD order. Bangladesh retail listings show a three-year warranty reference for their own offers, but that does not identify BiponiBD’s seller, warranty provider, coverage, start date, service location, dead-pixel policy or claim procedure. Confirm these details for the exact unit before purchase and retain the invoice and serial information. Price, promotional discount, stock status, delivery time and return terms are likewise seller-specific and can change. The manufacturer datasheet establishes product specifications; retailer pages are used only for local market context and are not represented as BiponiBD inventory or warranty evidence.
Model suffix and source differences
This product is DHI-LM27-B221S. The official datasheet dated for the S model is the primary source for technical claims. It gives 250 cd/m² typical brightness and 1200:1 contrast, whereas some retail summaries state 300 nits and 1500:1. The same exact S datasheet specifies software blue-light protection and 2 × 1W internal speakers. Neighboring Dahua DHI-LM27-B221 has a different speaker arrangement and other listed details; DHI-LM27-B221B is another model with its own dimensions and specifications. Search results often reuse product family prose and images, so the last character should be checked before applying a claim. The title, model fields, features, attributes and FAQs have been aligned to B221S. The original BiponiBD slug stays intact to preserve existing links; its current path does not change merely because descriptive content is improved.
Who this monitor may suit
The DHI-LM27-B221S may suit someone looking for a 27-inch IPS Full HD panel, a 144Hz refresh option, HDMI and DisplayPort connectivity, built-in 2 × 1W speakers and a 75 × 75 mm VESA mount. It may be less suitable for users who specifically want QHD sharpness at 27 inches, a height-adjustable stand, higher-than-250-nit typical brightness, measured professional color accuracy or a separate manufacturer GTG response figure. Before ordering, check that the graphics device can output Full HD at 144Hz over the intended HDMI 2.0 or DisplayPort 1.4 connection, then confirm seller offer, warranty and box contents. The product photos show the front, angled front and rear casing; they do not verify the physical serial, included cable, current stock, pixel condition or a particular warranty. Choose based on your desk, workload and required connections rather than the gaming label alone.
Specification summary
Features
- 27-inch IPS panel with ELED backlight, 1920 × 1080 Full HD resolution and a 16:9 aspect ratio.
- Dahua specifies a 144Hz refresh rate for this exact DHI-LM27-B221S model.
- The manufacturer rates response at 1ms MPRT; this is not a gray-to-gray or input-lag figure.
- Official typical brightness is 250 cd/m² and static contrast is 1200:1; retailer summaries listing 300 nits or 1500:1 conflict with the exact-model sheet.
- The display supports 16.7 million colors and a stated 72% NTSC gamut, with 178° horizontal and vertical viewing angles.
- One HDMI 2.0 input and one DisplayPort 1.4 input each support 1920 × 1080 at 144Hz according to Dahua.
- One audio output and built-in stereo speakers rated at 2 × 1W are specified by the manufacturer.
- Dahua lists software blue-light protection; the exact sheet does not describe it as a hardware filter.
- The included stand tilts from −5° to +15°; the datasheet does not list height adjustment, swivel or pivot.
- A 75 × 75 mm VESA pattern supports compatible wall mounts and monitor arms.
- The exact datasheet separates the 3.84kg net monitor weight from 5.29kg gross package weight and specifies carton dimensions.
- Power is supplied by a 12V DC, 3A adapter; official consumption figures are 21W basic, 27W typical, 29W maximum and below 0.5W standby.
Advantages
- Exact-model manufacturer documentation is available, so the product can be distinguished from related Dahua B221 and B221B displays.
- A 144Hz Full HD panel can provide smoother motion when the computer, cable and settings deliver compatible frames.
- HDMI 2.0 and DisplayPort 1.4 are specified for FHD at 144Hz, avoiding ambiguous version claims.
- Built-in 2 × 1W speakers, audio out, a power adapter and a base are listed in the manufacturer package information.
- The 75 × 75 mm VESA pattern, unit dimensions, carton size and separate net/gross weights are documented.
Points to consider
- Full HD on a 27-inch screen has lower pixel density than QHD at the same size, which can make fine text look less crisp at close range.
- Official typical brightness is 250 cd/m², lower than the 300-nit value appearing in some local retailer summaries.
- The stated contrast ratio is 1200:1, not the 1500:1 shown by some copied retail specifications.
- The stand specification lists tilt but does not list height adjustment, swivel or pivot.
- The 1ms figure is MPRT; Dahua does not give a separate gray-to-gray response time or input-lag measurement in this sheet.
- Bangladesh warranty statements belong to individual retailers; BiponiBD seller, serial eligibility, coverage and current stock must be checked separately.
Frequently asked questions
What is the exact product model?
This listing is for Dahua DHI-LM27-B221S. Confirm the full suffix on the unit or carton; DHI-LM27-B221 and DHI-LM27-B221B are separate models whose specifications must not be substituted.
What resolution and refresh rate does it support?
Dahua specifies native Full HD at 1920 × 1080 and 144Hz. The exact sheet states that both HDMI 2.0 and DisplayPort 1.4 support 1920 × 1080 at 144Hz. The source device and display settings must also be configured for that mode.
What panel type and backlight are used?
The manufacturer identifies a 27-inch IPS LCD panel with ELED backlight, a 16:9 aspect ratio and 178° horizontal and vertical viewing angles.
What does the 1ms response time mean?
The manufacturer specifies 1ms MPRT. MPRT describes moving-picture response and is different from gray-to-gray pixel transition time or end-to-end input lag. Dahua does not list a separate GTG value in this sheet.
What are the correct brightness and contrast figures?
The exact DHI-LM27-B221S datasheet lists 250 cd/m² typical brightness and a 1200:1 contrast ratio. Some local listings show 300 nits and 1500:1; those values conflict with the manufacturer document and are not used here.
Which video and audio connections are included?
Dahua lists one HDMI 2.0 input, one DisplayPort 1.4 input and one audio output. Both video inputs are specified for Full HD at 144Hz. The sheet also lists built-in speakers rated at 2 × 1W.
Does it include built-in speakers?
Yes. The exact Dahua datasheet specifies 2 × 1W speakers. Their practical loudness and sound quality are not quantified, so external speakers or headphones may still be preferred.
Does it have blue-light protection?
Dahua lists software blue-light protection. It can change the displayed color tone and should not be treated as a medical claim or a guarantee against eye fatigue.
Can it be mounted on a monitor arm?
Dahua specifies a 75 × 75 mm VESA pattern. Check the arm’s plate pattern, screws, clearance and load rating before installation.
How adjustable is the stand?
The specification lists tilt from −5° to +15°. It does not list stand height adjustment, swivel or pivot. Use a compatible VESA arm if those movements are needed.
What are the dimensions and weight?
Without the wall-mount bracket, the monitor measures 614.1 × 363.0 × 45.1 mm (W × H × D). Net weight is 3.84 kg. The package is 694 × 458 × 114 mm and 5.29 kg gross.
What warranty, price and box contents apply to this offer?
Dahua lists an adapter, base, HDMI cable and user-manual QR information among package items. Bangladesh retailers show their own three-year warranty references, but BiponiBD price, stock, included items and warranty provider/claim terms must be confirmed with the specific seller before purchase.
Technical specifications follow Dahua's exact DHI-LM27-B221S datasheet. Current BiponiBD price, availability, seller warranty and actual shipment contents must be confirmed for the specific offer.
