Just like a typical rail attach EOTech style red dot holosight only smaller and lighter, this model is barely over 9cm long and coming in around 200g. It runs off a CR123A battery (not included) which slides into an easy access compartment on the front with a simple screw-cap.
With a 33 x 25mm sight picture it is generously spaced with the square shape many eyes finding more natural to sight through than circular ones. The dot projection is a dot center halo type; brightness is adjustable on the fly with buttons and color can be switched between red and green just as easily.
Sight can be zeroed via elevation / windage dials on the side which require a flathead screwdriver, small coin or similar such object to engage.