German Quality. Powered by Tradition. Features: High brightness LD blue light tube provides extremely clear lines Dust-proof, waterproof and drop resistance proofing design Samsung 3500mAh Li-ion battery ensures tool longer run time and battery life Specifications: Model KI100 Projection 5 lines + 2 plumb points Laser line wavelength 505 nm (Blue light) Line accuracy ±1 mm at 7 m away Line width 2 mm at 5 m away Self-leveling range ±3° Self-leveling adjust time < 4 seconds Horizontal emissive angle 120° Vertical emissive angle 130° Operating temperature (-10) - 45°C Dust and splash protection IP 54 Battery capacity 4V Li-ion 3.5 Ah Operation time About 3 hours