In a simple version, the terminal will look like this:
A phone and a USB-> micro USB cable can be bought at any cell phone store in your city, and a scanner can be found at any store selling retail equipment.
True, this bundle does not always work, for it to work, the smartphone must support OTG technology (USB OTG - from English On-The-Go) is a USB function that is designed to easily connect USB devices to each other without the need for a computer). Check your phone before buying.
And ideally, a bunch are needed like these:
Better yet, a ready-made terminal based on Android:
Although, however, you can collect any terminal configuration that is convenient for you specifically:
There are completely ready-to-use terminals on the market:
