Difficult to operate - Vism 1x 25mm Micro Red/Blue Reflex Dot Sight, w/Integrated Laser, 3 MOA Dot Size

Once turned on this is a decent sight, but the controls are far from reliable. The instructions state that the two adjustment buttons should be pressed simultaneously for a couple of seconds, but it takes several attempts before the reticle illuminates, making the sight useless for defense applications.