OKI B721DN Duplex Printer

The frequency of the alternating current supplied to the device, expressed in hertz (Hz). It indicates the acceptable operating range for the electrical mains that powers the product.

The alternating current voltage range that the product accepts from its power source, expressed in volts (V). It indicates the minimum and maximum supply voltages compatible with the device.

Indicates whether the product contains a built‑in central processing unit (CPU) that can execute instructions without requiring an external processor module. A value of "Yes" means the device has such a CPU; "No" means it does not.

A list of official certifications or compliance marks that the product has received from regulatory bodies, safety organizations, or industry standards groups. Each entry represents a distinct certification such as CE, FCC, RoHS, UL, or WEEE, and may include additional details like version numbers or specific test reports.

The colour or combination of colours that a product is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the item for consumers.

The linear measurement of an object from front to back or top to bottom, expressed in a physical unit such as millimeters, centimeters, inches, etc. It indicates how deep the item is and can be used for fitting, compatibility, or spatial planning.

The weight of paper or other media that is suitable for duplex printing, expressed as a range in grams per square meter (g/m²). This attribute indicates the acceptable thickness and density of sheets that can be fed through a device to achieve reliable double‑sided output.

Indicates whether the device can automatically print on both sides of a sheet in a single pass. A value of "Yes" means duplex printing is supported; a value of "No" indicates that only single‑sided printing is available.

A list of envelope sizes that a product can accept, expressed with standard codes or names (e.g., "DL", "C5", "10"), optionally combined in comma‑separated groups to indicate compatible envelopes.

Indicates whether the product includes an Ethernet LAN interface for wired network connectivity, allowing data transmission over RJ‑45 or compatible cables.

The vertical dimension of a product measured from its lowest to highest point. It is expressed in a physical unit such as millimetres, centimetres or inches and applies to any item where height is relevant, including books, electronics, furniture and other objects.

The total amount of internal memory available in a device, expressed as a data size such as megabytes (MB) or gigabytes (GB). It indicates how much information the component can hold for active processes and affects multitasking performance.

List of Linux operating systems that the product can run or support, including specific versions and architectures when relevant. Each value represents a distinct Linux distribution or kernel version supported by the hardware or software.

A list of macOS operating system versions that the product supports or is compatible with, such as "macOS 10.15 Catalina", "macOS 11 Big Sur" or newer releases. Each entry represents a distinct OS version that can run on or be supported by the device.

A list of network protocols that a device can use for configuration, monitoring and remote management, such as SNMP, HTTP/HTTPS, Telnet, SSH or other standard interfaces. Each protocol is represented by its common name and may be separated by commas or slashes in the source data.

The maximum number of pages a printer, copier or fax machine is designed to handle in a typical month of operation. It indicates the expected workload capacity and helps users compare how heavily different models can be used before reaching their limits.

The maximum number of sheets or pages that a printer, copier, or fax machine can accept in a single feeding cycle. It indicates the largest input tray capacity and helps users understand how many pages can be processed automatically before needing to reload paper.

The largest amount of internal random‑access memory that a device can support, expressed as a data size such as megabytes or gigabytes. It indicates the maximum capacity for active processes and multitasking performance.

The largest standard ISO A-series paper format that a device can handle, expressed as the ISO code (e.g., "A4", "A3"). This attribute indicates the maximum sheet size supported by printers, scanners, copiers, and similar equipment.

The largest paper or media size that a printer can handle, expressed either as standard format names (e.g., "A4", "Legal") or as physical dimensions in millimeters or inches. It indicates the maximum sheet dimensions supported by the device for printing.

The maximum pixel dimensions of a display or image, expressed as width by height (e.g., 1920x1080). It indicates the highest resolution that a device can output or support and is commonly used for monitors, TVs, smartphones, cameras, and digital images.

A comma‑separated list of mobile printing services or protocols that a device can use to send print jobs from smartphones, tablets or other mobile devices. Typical values include Apple AirPrint, Google Cloud Print, Mopria Print Service and similar cloud‑based solutions.

The maximum number of paper sheets that a multi-purpose tray can hold for automatic feeding. This value indicates how many pages the device can process before needing to be reloaded, helping users compare throughput and convenience across models.

The weight of the paper or media that can be placed in a multipurpose tray, expressed as grams per square meter (g/m²). This value indicates how dense the material is and helps users compare the quality or thickness of different papers used in printers, copiers, and similar devices.

The total count of individual cartridge units included in the product package or supplied with the device. It represents how many separate cartridges—such as ink, toner, filter, or other consumable cartridges—are available for use or replacement.

A list of natural languages in which the page descriptions or captions of a product are available. This attribute indicates the linguistic options for textual information that accompanies each page, such as titles, annotations, or metadata.

A list of the paper or media types that a printer’s input trays can accept, such as envelopes, labels, plain paper, recycled paper, and transparencies. The values are free‑text strings separated by commas, allowing users to see which materials are compatible with the device.

The type of printing process or technology used by the product, such as laser, inkjet, thermal, LED, or other specialized methods.

The fundamental operating frequency of a processor, expressed in hertz (Hz). It indicates the speed at which the CPU runs under normal conditions and is typically reported in gigahertz (GHz) or megahertz (MHz). This value helps users compare performance potential across different models.

The expected number of pages a printer, copier or fax machine is designed to produce in an average month under normal operating conditions. It indicates the workload capacity that the device can handle without overheating or failure.

The sound power level produced by a device while it is in standby mode, expressed in decibels (dB). This value indicates the acoustic intensity of the product when it is powered on but not actively performing tasks, helping users assess suitability for quiet environments.

A list of the physical or logical interfaces that a device can use to connect with other devices, such as USB, Ethernet, Bluetooth, Wi‑Fi, RS‑232, RJ‑45, Parallel, and similar standards.

The maximum amount of material that can be fed into the device in a single operation, expressed as a numeric value followed by an appropriate unit such as sheets, pages or volume.

The maximum number of individual pages that a product—such as a book, magazine, or printed publication—can contain. It represents the total count of physical sheets, regardless of layout or formatting, and is useful for assessing the length or volume of the material.

Represents the count of external USB 2.0 (high‑speed) connectors available on a device. The value is an integer indicating how many USB 2.0 ports can be used for data transfer or power delivery from the outside of the product, regardless of internal placement or version.

The mass of the product expressed in a standard unit such as grams or kilograms. It represents how heavy the item is and can be used for shipping calculations, handling instructions, or consumer information.

Indicates whether the product has built‑in Wi‑Fi capability, allowing it to connect to wireless networks without requiring external adapters or dongles.

The horizontal measurement of a product, expressed in a linear unit such as millimetres or inches. It indicates how wide the item is from one side to the other and is used for sizing, fitting, and compatibility purposes.