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Works with 2 included LR44 batteries. It works like a doctor sight:
Red dot vary light levels in the surroundings. The brightness sensor on the front side of the sight .
Surroundings dark, red dot will be dimmer; Surroundings bright, red dot will be brighter.
Does NOT contain a separate ON/OFF switch. It is in the power-saving mode (off) when it is covered.
The fiber optic provides light to the sensor, nothing more.
Very rugged and good markings. polarizing filter works very good, but I don't try to remove it.


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