Johnson 40-6681 JLX Self-Leveling 180 Degree Cross-Line Laser With GreenBrite Technology. GreenBrite Technology – 400% more visible than red lasers. Leveling Method: Self-Leveling (Pendulum). Laser Wavelength: 520nm±10nm (Green). Laser Classification: Class IIIa. Maximum Power Output: =5mW. Interior Range: Up to 200 ft, Detector range up to 75 ft. Power Supply: 4 “AA” alkaline batteries (not included); Li-ion rechargable battery pack (included). Tripod Thread: 1/4- 20. Includes: Green laser with magnetic base, magnetic target, li-ion battery and charger, alkaline battery compartment (alkaline batteries not included), hard-shell carrying case.