These are really well made robust sights made by Optronics.
They can be used on Airguns, Airsoft Guns, .22 Rimfire, Paintball Guns etc.
Very Clear Sharp 3MOE Reticule.
Push the buttons on the front to switch it on & off
& to Adjust the Brightness.
Ideal for Fixed Targets from 10yds-Infinity.
Plus moving Targets, Hunting & Skirmishing.
This is very easy to zero up with two adjusting screws.
Brilliant to use with both eyes open.
They use a standard CR123A Rechargeable 1 of which is included.
Very solid all Metal construction.