What characteristics might I expect from my Night Vision device?

All Bushnell Night Vision Monocular scopes are activated in a way that can not be left on when not in use. The power button is designed to give power only while being depressed. The binocular devices do have on/off switches that require the user to remember to turn off the unit. Some level of "buzzing" sound is quite normal and is intended to be useful in remembering to turn off these units when done using them. The image of a night vision device will not be as sharp as that of a daylight binocular. This is due largely to the image being generated on a phosphor screen. Black spots may be visible in the image. This comes as a natural process of manufacturing the intensifier tubes. 

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