100% New Tactical QD 553 Type Holographic Sight (S553) Features: * 10 level brightness level adjustment ( Red / Green ) * Auto power save ( 2 hours auto shutdown after last key used ) * With Quick Release Level for easy attachment / detachment * Fit for any 20mm weaver mount * Made by aluminum alloy with black matt. * Water and shock resist * Magnification: 1x * 2x AA Alkaline Batteries ( included )

How to operate:

A Power ON and brightness adjustment + B Brightness adjustment - A + B Power OFF ( depressing both key simultaneously ) C Reticle color switching ( Red / Green )