Product for smart glass has 2 main buttons to manipulate the (...). The first button is the mute button, open the device is placed in the same set-top box. The layout button is located with the other button to avoid having the user click on the other buttons with confusion. The second button is the finger touch, this zone was designed and set up a completely separate side of the set-top box. Compared with the profile of the average finger about 50 px, then the length of the sensors is 113px and height is 56 px. Having the region with an area of 113px x 56px, the fingers can easily manipulate and ordered the equipment that is not afraid to be confused with any other button. Apply the formula below, we can calculate the time to manipulate users with each button
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