Pressing this button will also illuminate the display screen for 10 seconds if power unit is in battery operation (screen will always be illuminated in mains operation).

如果使用电池供电，点摁此按钮后，显示屏仅显示10秒钟(在主要操作时，显示屏始终明亮显示的)。

youdao

Packed with advanced imaging technology, the HTC TITAN II features a 16-megapixel camera with a wide-angle lens, autofocus, dual LED flash, red eye reduction, image stabilization, a backside-illuminated sensor and a physical camera button, offering a viable replacement for digital point-and-shoot cameras.

ENGADGET: HTC Titan II coming to AT&T, finally delivers LTE to Mango lovers

Before going to sleep each night, I pressed and held a button on the Up that illuminated a tiny moon on the band, indicating I was going to sleep.

WSJ: A Health Monitor to Nudge You as It Keeps Watch