General Description:● 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 is off， when turning to L and H， power is on and brightness of the dot changes from LOW to HIGH● Adjustable windage compensation， elevation and brightness for night and day● Tough aluminum so it will not cause the gun tosway， lightweight but very sturdy● Can fit multiple types of rails， sigh cover protects from anything minor● Slim，short， and skinny， looks sleek and adds to the look of a gun ● Sharp and clear reticleNote:●Looking directly at the sun through this sight may cause permanent eye damageBattery:● It Lighten with 1 x 3V lithium battery ( CR2032 ) and comes with a spare battery included inside the box Package weight: 0.197 kg Package size (L x W x H): 13.50 x 9.70 x 4.40 cm / 5.31 x 3.82 x 1.73 inches Package Contents: 1 x Tactical Mini Holographic Reflex Sight Red Dot Scope Light Adjustable Brightness， 1 x Manual in English， 1 x Wipe Cloth， 2 x Hex Wrench，2 x CR2032 Battery