--This tubeless-design reflex lens aperture provides a wide field of view. 

--Suitable for rapid-firing or shooting of moving targets besides 

normal shooting. 

--This red dot contains a separate switch with 3 steps for 

OFF, LOW BRIGHTNESS, HIGH BRIGHTNESS When 

the switch turned to"off", power if off. 

--Whrn turning to "L" or "H", power is on and brightness of the dot 

changes from "LOW" to "HIGH".

How to use it? Please click here: 

https://www.youtube.com/watch?v=riN2dZDaxYI

Installing battery:

-Using the Allen (provide in package) wrench to remove two hex screws. 

-Turn the sight upside down to remove the bottom part of sight

(weave base). 

-Replace it with 3V lithium battery(CR2032).

Mounting: 

-The red dot sight fits standard weaver base. 

-Simply unscrew the weaver base knob and place the sight 

-over weaver base on top of your gun and tight it firmly.

Parts:

-- Switch for "off, low brightness, high brightness"

-- Lens

-- Weaver base knob -- Hex screws 

-- Elevation adjustment screw 

-- Windage adjustment screw

-- Locking Screws

Description:

Dimensions: 40 mm (length) x 28 mm (width) x 35 mm (height)

Weight: 2.1 OZ

Dot Size: 3 MOA

Color: Red

Body color: Black

Power: 1 x CR2032 3v battery

Package includes:

-- Tactical Holographic Red Dot Sight

-- Two hex wrenches

-- Cleaning cloth

-- Storage box

-- Owner's Manual

-- 1 x CR2032 3v battery

NOTE:

Pls check the size carefully before you buy.