Applying the principles of design usability with three key elements: effective to use, easy to learn and easy to remember how to use. The entire design of the focus functions more simply used with a single button, users can easily order the device makes it all the very simple one. The fake chemical application equipment with one button operation will also make the user feel more interested and excited when they do not have to remember too much for the task on each of the buttons and function buttons What activities.
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