The red dot intensity also auto adjusts to ambient light. If there is not enough light, such as at night, just press the "+" or "-" button to activate battery power.
Now it will operate like a regular red dot such as the HS403A. You can adjust the intensity by pressing "+" or "-" buttons. The unit is now automatically in solar powered mode, ready when you need it. You can verify the power mode by covering the solar cell. If the red dot is on, you are in battery mode.
If it is off, you are in solar mode. Features of PARALOW HS403C Red Dot Sight. Designed for day use and night vision. New advantage technology LED allows 50,000 hours of operation on one battery. 2 MOA on dot size.
Reduced training time and ammunition. Parallax-free with unlimited eye relief.
Unaffected by extreme weather conditions. Low mount and 1/3 Co-witness mount included. What that means is if you order. It depends on where you live.