Description:This boresighter is designed for observation in your shotguns without shooting. Simply install the included batteries, place the entire assembly in the chamber and gently close the action. The reticle emits a simple red laser beam, providing a precise reference for zeroing in the reticles or ranges. Features:Fits 12 Gauge shotgun chambersLightweight and durableGuns with any sights (iron, optical, laser, holographic, etc.)Long Viewing Range Specifications:Max. Output Power: Less than 5mWMattery: BrassLaser Wavelength: 635-655nmObservation Range: 15 to 100 yardsDot Size: 1.5" 100 yardsLaser Beam: lt; 5mW Shell: Red Power Source: 3 x LR44 Button Batteries (Not Included) Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you make a bid, due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Non-retail Package Package Included:1 x Laser 12 Gauge Boresighter1 x User Manual FAQ: 1. Is there a tracking number for my item? Yes, we ship every order with their tracking number, and you can see the status of your shipment on the respective website. 2. Is the product the same as the pictures? Yes, all photos are real. We took these photos ourselves. 3. What size can fit me? We suggest you look at our size suggestion chart below and our product size chart if you have a normal figure. If you have a special figure, please fit in (tell us your height and weight, bust, waist, hip size). 4. I am a seller, I would like to buy many pieces of the item, what is the price? Hi, thank you for your inquiry, if you want to buy large quantity, please send to us, we will give you the best price, thanks!