Parameters of Portable Printers

　　Portable printers have several important parameters that determine their performance and functionality. One of the key parameters is print resolution. It is measured in dots per inch (dpi) and indicates the level of detail and sharpness in the printed output. Higher dpi values, such as 1200 dpi or more, result in clearer text and more vivid images. Print speed is another crucial parameter. It is usually measured in pages per minute (ppm). Different portable printers have varying print speeds depending on their technology and design. For example, some basic models may print around 5 to 10 ppm, while more advanced ones can reach speeds of 20 ppm or higher.

　　The paper size compatibility is an essential consideration. As we are focusing on A4 portable printers, they should be able to handle A4 size paper efficiently. However, some printers may also support other paper sizes such as A5, envelopes, or photo paper. Connectivity options are also significant parameters. Wireless connectivity like Wi-Fi and Bluetooth is highly desirable as it allows for easy connection to multiple devices. Some printers may also have a USB port for direct connection to a computer. Battery capacity and life are important for truly portable printers. A larger battery capacity, measured in milliampere-hours (mAh), generally means longer battery life and more printing tasks can be completed on a single charge. For example, a printer with a 2000 mAh battery may last longer than one with a 1000 mAh battery. Additionally, the size and weight of the portable printer are parameters that affect its portability. A lighter and more compact printer is more convenient to carry around. Other parameters may include the type of printing technology used (thermal, inkjet, etc.), the maximum number of pages the input tray can hold, and any additional features like duplex printing or color printing capabilities.

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