Electric control box with four buttons a unique user-friendly design of one-touch operation, convenient and quick.

电控箱采用四位按钮独特的人性化设计单键操作，方便快捷。

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With only four buttons, it is questionable whether this needs to be encoded in the database, as well.

由于只有4个按钮，是否也需要在数据库中对其进行编码还存在疑问。

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Once the correct PIN is entered on the card's four buttons, the missing digits are filled in and the card's magnetic strip is populated with data.

一旦用户通过小键盘上的四个按钮输入正确的个人身份证号码，缺损的数字才会显现出来，这样才能看到完整的卡号；而且这时信用卡的磁条也会被填入数据，磁条锁定便被解开可以在网上或者商店购物。

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Overall the face design is the same, with four multifunction buttons around the screen adjusting to software and orientation changes.

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They seem to range from some slightly more sophisticated handsets with cameras to phones with just four buttons programmed to call family or summon help.

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Four buttons with infrared sensors on the rotary controller allow switching between different menus, such as audio, apps, communications and navigation.

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