EOTech 556 - Manual (Page 9)

Pushbutton switches are used to vary the brightness intensity of the holographic reticle pattern. Pressing
and releasing the pushbutton switch will change the brightness level UP or DOWN one (1) step from the
previous setting. Pressing and holding the UP arrow or DOWN arrow switch will change the brightness level
up or down continuously in steps. Twenty (20) brightness settings provide a dynamic range of 110,000:1
from the lowest setting to the highest setting.
4. Auto Shutdown
The sight has an auto shutdown feature. If the sight is turned on by pressing the UP button, it will
automatically shut OFF 8 hours after the last pushbutton control is used. The sight will automatically shut
OFF after 4 hours if it is turned on by pressing the DOWN button.
2.1.5 Night Vision Mode On/Off Auto Shutdown
The 557.AR223 is compatible with Generation II, III, III+ and IV+ Night Vision Devices. When in any of the
night vision settings, the reticle brightness is low enough that when viewed with a night vision device, the
reticle image will not bloom.
1. ON/Night Vision Mode and 8 Hour Auto Shut Down
Pressing the NV Button (see Fig. 4) will turn the sight ON in Night Vision Mode. The sight will turn on at
Level 4 and automatically shut off 8 hours after the last pushbutton control is used. There are 10 brightness
settings in NIGHT VISION MODE with a dynamic range of 1000:1.
2. OFF/ Turning Sight OFF
To turn the sight off, press both the UP and DOWN arrows simultaneously. Verify that the sight shuts off by
looking though the heads-up window with the night vision device.
3. TOGGLE/ Between Normal and Night Vision Modes To toggle between NORMAL and NIGHT VISION
MODES, press the NV button. When switching between modes, the sight will remember the last brightness
setting. NOTE 3: When used with a Night Vision device, always check to make sure the sight is not turned
on before pressing the NV button to turn on the sight in the Night Vision mode. Otherwise, it will toggle to the
Normal mode and saturates the image intensifier.
2.1.6 Windage and Elevation Adjustments
Figure 7: Windage and Elevation Adjustments
The sight provides tactile and audible feedback (“click”) when the elevation and windage adjustment controls
are rotated during adjustment. The elevation and windage adjustments are located on the right-hand side of