Specifications:
Material: Aluminum alloy.
Small end Diameter: 4.3mm (0.169inch)
Class: IIIa.
Max. Output: ≤ 4.9mW.
Wavelength: Red 630-680nm. Green 532nm.
Batteries: CR2 3V 800mAh (non-rechargeable).

Packing Includes:
1 x Boresighter
12 x Adapters (Fit barrels from .17 to 0.78)
2 x CR2 battery
1 x Screwdriver

【12 Adapters of Specifications】
[Adapter 1#]: .17 to .18 cal.
[Adapter 2#]: .20 to .243 cal.
[Adapter 3#]: .235 to .27 cal.
[Adapter 4#]: .27 to .315 cal.
[Adapter 5#]: .30 to .36 cal.
[Adapter 6#]: .335 to .40 cal.
[Adapter 7#]: .37 to .45 cal.
[Adapter 8#]: .43 to .50 cal.
[Adapter 9#]: .47 to .55 cal.
[Adapter 10#]: .535 to .61 cal.
[Adapter 11#]: .57 to .64 cal.
[Adapter 12#]: .69 to .78 cal.

NOTE
Before make an order, please make sure that your gun matches our boresighter model.

WARNING
Keep green/red dot beam away from eyes.
Before boresighting your scope, make sure that the firearm is unloaded and the barrel is pointed in a safe direction.
After the scope is adjusted, turn off the power, make sure to remove the boresighter and adapter from the barrel.