Instructions:
1. Assemble the battery into the boresighter.
2. Select the proper adapter that fits in the barrel of your firearm.
3. Assemble the adapter on the small end of the boresighter, then screw the adapter tight to make sure the adapter will be hold well.
4. Push the small end of the boresighter with the adapter into the barrel of your firearm. Make sure the boresighter is inserted in until it is sung with the barrel opening of your firearm.
5. When you turn the light on, a small red or green dot will be emitted. And then you can adjust your scopes windage and elevation so that your crosshair aims at the red or green dot.

Warning:
Keep boresight beam away from eyes.
Before boresighting your scope, make sure that the firearm is unloaded and the muzzle is pointed in a safe direction.
After the firearms is boresighted, make sure to remove the boresighter and adapter from the firearm.

Specifications:
Material: Aluminum.
Weight: 1.65oz
Length: 6.57
Big end Diameter: 0.8.
Small end Diameter: 0.169.
Shortest barrel available: 1.95.
Wavelength: Red:630-680nm; Green:532n.
Max. Output Power: 4.9mW.
Light class: IIIa.
Light Color: Red or Green.
Batteries type: CR2 3V 800mAh, non rechargeable.

Packing List:
1 x boresighter
12 x Adapters (will fit almost all calibers from .17 to 12ga)
2 x CR2 battery (800mAh each battery)
1 x Screwdriver
1 x Instructions
1 x Padded storage box