Capture a still image of any screen you're looking at by simultaneously pressing the power button and the volume down button.

同时按下电源按钮和音量降低键可截取你正在观看的任何屏幕的静态图片。

youdao

There are a total of three, power/lock (one button) and up/down volume (two buttons).

共有三个，开机/锁定(一个键)、上/下（两个键）。

youdao

On the top of the nano are a Sleep/Wake button and shuffle-like Volume Down and Volume Up buttons.

在 nano 的顶部有个睡眠/唤醒按钮以及和 shuffle 类似的音量降低和音量升高按钮。

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On the top of the device, you'll find a micro-USB port for charging and syncing and if you shimmy down its right side you'll be greeted by the power button and volume controls.

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For a split second, we forgot that the magnifying glass next to volume down actually means "zoom out, " and as such we are still lacking a dedicated search button.

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Most of these gizmos, like the hipKey and Proximo, work in reverse, too: Pressing a button on the sensor will make your smartphone ring even if the volume is turned down.

WSJ: Track Your Lost iPhone and Other Gear With These Gizmos