Name: Adjustable Laser Aiming Instrument Model G20 Short version: Length 12.2 cm, Diameter 2.54 cm Size Long: Length 15.2 cm, Diameter 2.54 cm Material: High strength aviation aluminum alloy 6061 aluminum alloy Color Surface Black Third Grade Hard Oxidation Treatment Weight: Approximately 200 grams of battery installed Red light at 100 meters at night, not suitable for use during the day Product range Green light at 100 meters during the day and 2000 meters at night The direction of the wick can be adjusted to move up, down, left, and right