Brand: Datasensing Item: Laser alignment tool Includes: 2 AAA batteries Light Emission: Class 2 red laser For Use With: SG4 and SH4 series light curtains Operating Range: 50m Datasensing laser alignment tool, Class 2 red laser light emission, 50m operating range. For use with SG4 and SH4 series light curtains. 2 AAA batteries included.