The HS403C Has Two Power Systems, One Is Operated by Solar Power Only While the Other Operates on Battery Only.
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 So You Can Adjust the Intensity By Pressing "+" Or "-" Buttons.
2 MOA on Dot Size
Dual Powered by Solar Cell and Battery
50,000 Hours of Operation on One Battery
Memory Function of Brightness Setting
Low Mount And 1/3 Co-Witness Mount Included