Minimum Range for Sighting: 15 yds    Maximum Range for Sighting: 100 yds    Wavelength: 645nm， 632nm (.223 20X)    Operation: On/Off End Cap    Battery Life: ~ 20 min    Laser Type:Visible Red Laser    Power: < 5mW    Construction: Brass    Dot Size: 1.5 @ 100 yds.Note: Exclude the battery except USA(Battery Model AG3)