Acer GN246HL - Manual (Page 33)

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If you are charging the wireless glasses by connecting them to your PC using a
USB cable, make sure your PC does not go into power save mode. When your PC
goes into power save mode, the wireless glasses are no longer charging. To fix
this, disable any power-saving options on your PC under the Windows Control
Panel. Alternatively, you can use a USB wall charging device to charge the
glasses directly from your wall power outlet without connecting to the PC. You
can use your glasses while they are charging.
Using the glasses
It is a good idea to keep the glasses in the protective pouch when you are not
using them. When wearing your glasses, you must be in line-of-sight with the IR
emitter. Press the ON button to turn the glasses on. The glasses turn off
automatically when there is no activity.
Warning: The wireless glasses are not prescription eye wear,
sunglasses, nor protective goggles. Do not use the glasses for any
general eye wear purposes (e.g. driving, reading, protection from
sunlight or ultraviolet light, etc.) as such use may result in injury.