Size of a keyboard depends on the number of keys. Keyboards with 32 keys are the smallest and keyboard with 128 keys and has integrated MSR are the biggest. When choosing keyboard size one should consider expected functionality (needed number of keys). When planning business automation one should keep in mind user-friendliness of the entire POS system. Keyboard should fit well working place that operator could enter data instantly. Space for hands is one more thing to think about.
Manufacture and sale of electronic POS-equipment for the automation of trade