Instructions in Russian. The reticle change button also acts as on/off. Press once to turn on. Hold for at least 5 seconds to turn off. Press quickly to shift between reticle choices. Be sure to follow correct battery polarity position when inserting battery. There are YouTube videos showing how to zero sight. It is fairly straightforward but requires patience. I have zeroed this to a airsoft rifle that never saw the light of day out of my basement beyond target plinking. Sight is essentially new and not used on a real firearm although it is more than capable. Purchased as there was no replicas for this platform and I wanted an AKS-74u impression from COD with the T reticle LOL. Alas, I never used and it needs to find a loving home for someone to use. Manufacturer is Axion. The Axion Kobra AK Red Dot provides a wide field of view and allows you to shoot with both eyes open so that you can comfortably take down targets with peak accuracy. These Red Dot Sights by Axion offer 4 reticle options including single dot, open T, reversed chevron or reversed chevron with dot on top. This Axion Kobra 1x32mm AK Red Dot is built tough and is completely waterproof for use in rainy conditions. Specifications for Axion Kobra AK Red Dot: Color: Black Magnification: 1 x Objective Lens Diameter: 32 mm Reticle: Red Dot Illumination Color: Red Brightness Settings: 16 Eye Relief: Unlimited Field of View, Angle: 6 degrees Attachment/Mount Type: Universal Battery Type: CR2 Battery Quantity: 1 Battery Life: 70 hours Operating Temperature: 50 Celsius Water Resistance Level: Waterproof Gun Make: Kalashnikov Gun Model: Dragunov Sniper Rifle Length: 144 mm Width: 66 mm Height: 144 mm Weight: 0.9 lb Included Accessories: Carry Case Cleaning Cloth Rubber Sun Hood, Rubber Sun Hood, Cleaning Cloth, Carry Case Magnification Type: Fixed