Feature: 1. MAIN USE: This laser bore sighter can quickly and accurately readjust any view, which is convenient and efficient to use. 2. LONG DISTANCE USE: Laser highlights can be seen more than 100 yards away at night. You can also use the calibration instrument at night. 3. ALUMINUM ALLOY MATERIAL: Made of aluminum alloy material, the laser bore sighter is strong and lightweight, you can use the sighter for a long time without tiring your hands 4. APPLICABLE SCENARIO: The laser bore sighter is suitable for various hunting tools, use the sighter for more interesting hunting 5. EASY CARRYING: The laser bore sighter is small in size that you can easily store and carry it for convenient use. Specification: Item Type: Laser Bore Sighter Product Material: Aluminum Alloy Power Supply: 3 x LR44 button batteries (with batteries) Length: Approx. 155mm / 6.1in Application: Calibrator red laser targeting device Power: Less than 1mW (maximum output 1MW) Wavelength: 650NM. Package List: 1 x Laser Bore Sighter1 x Wrench 1 x Screwdriver 6 x Nut 3 x Button Battery