EOTech 553 - Manual (Page 23)

2.1.4 Electronic Features
All electronic controls are via pushbutton switches located at the rear of the unit housing as
shown in Figure 4. To ensure proper operation of the pushbutton switches, press firmly on the
center of the switch.
1. ON/ Auto Battery Check
Pressing the Up or Down Arrow pushbutton switches will turn the sight ON at Level 12. See
item 4 under this section for a description of Auto shutdown. The sight will automatically perform
a battery check every time it is turned on. If the batteries have less than 20% of life left, the sight
will turn on with the reticle image blinking on and off for 5 seconds. If the remaining battery life
is more than 20%, the sight will turn on with a steady reticle pattern. The battery condition can
be checked any time by turning the sight off and back on. The M553 reticle will blink when the
batteries have between 5 and 8 hours of useful life left.
2. OFF
To turn the sight off, simultaneously press both the UP and DOWN arrows. Verify that the sight
is on by looking through the heads-up display window for the reticle.
3. Brightness Adjustment
Pushbutton switches vary the brightness intensity of the holographic reticle pattern. Pressing
and releasing the pushbutton switches moves the brightness level UP or DOWN one (1) step
from the previous setting. Pressing and holding the UP arrow or DOWN arrow switch will
15