Powerful Red Laser Spot: With a clear and bright red laser, the Kinzon laser viewfinder can work well in any weather condition and is easy to install on most devices. Improve Precision Aiming at the target with high precision, providing precise zero reference in optical or iron sights, reducing ink cartridge waste, saving time and money, laser level: IIIA, maximum output power:<5 mW. Big button switch A highly sensitive button switch that can be lightly pressed to turn on/off the laser, making it easy to control. Equipped with CR2 battery. Equipped with 9 hole adapters, the Midten hole sight can perfectly mount 0.17 to 0.54 caliber rifles, pistols, pistols, and scopes. This kit will be suitable for all your hunting weapons or air guns. Our products have English language instructions for English speaking countries and French language instructions for French speaking countries. If you receive an article with an English notification in error, please contact us and we will immediately send you an English notification in PDF format. Note: Laser calibration and zeroing are carried out at the factory. However, you can manually calibrate the zero point of the laser. To achieve this, simply peel off the sticker on the viewfinder head and there are four screw holes. After installing the viewfinder in the barrel, it must be adjusted to zero through these four screw holes, which correspond to the top, bottom, left, and right.