This SSR15 with the Red Dot looks epic, wouldn't you agree?
Wide Desktop Picture – Mobile
The red dot's construction allows the use 2xAA battery. That's a massive amount of power resulting in long battery life.
Moreover, finding replacement batteries is as easy as it gets.
Just 3 buttons. Increase brightness with the two on the sides, switch color with the middle one. Turn off by pressing the two side buttons at the same time. That's it.
Red & Green
You can choose between red and green reticles. Not that it makes a difference but it's cool and you can mix it up if you get bored by it.