Epson LQ-2090IIN 550 cps Dot Matrix Printer

The number of characters that can be printed or displayed per linear inch, expressed as characters‑per‑inch (cpi). This metric indicates the text resolution of a printer, display, or other output device and allows comparison across models and technologies.

The highest number of characters a printer can output per second, expressed in characters per second (cps). This metric indicates the maximum throughput of the printing device and allows users to compare how quickly different printers can produce text or simple graphics.

The range of relative humidity (in percentage) within which the product is designed to operate reliably. Values are expressed as a minimum–maximum interval such as "20 - 80 %" and indicate the acceptable environmental moisture level for optimal performance.

The range of temperatures in which a product can safely operate without risk of damage or performance degradation. Values are expressed in degrees Celsius (°C) and may represent a single temperature, a minimum–maximum interval, or an average operating point.

A list of the paper or media types that a device’s input trays can accept, such as envelopes, labels, plain paper, recycled paper, and transparencies. Each value represents a material compatible with the printer or copier.

The count of electrical contacts or pins in the printer’s print head assembly, indicating how many separate signal lines are used to drive the printing mechanism. This number is relevant for dot‑matrix, impact, and some inkjet printers where the pin count determines print resolution, speed, and compatibility with specific ribbon or cartridge types.

The total number of characters a printer’s print head can produce before it needs replacement or maintenance, expressed as a numeric value that may include qualifiers such as "million". This metric indicates the expected longevity and durability of the print head for continuous printing operations.

The sound intensity produced by a printer while it is in operation, expressed in decibels (dB). This value indicates how loud the device is during normal printing tasks and helps users assess suitability for quiet work 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.

A list of Microsoft Windows operating system versions that the product is compatible with, including any relevant architecture or edition information.