The Bosch GLL 20-22 G Professional Line Laser is a robust and intuitive line laser made for a wide variety of applications. With an IP65 rating and rubber-enforced housing, it is made to withstand dust and water, so you can work with confidence in even the toughest conditions. The U-shaped laser window provides a broader fan angle for the horizontal line. Its dual power source, y BA 3.7V 3.0Ah XL Li-Ion battery and AA alkaline batteries, helps to eliminate downtime and increase productivity. The tool features a large battery indicator for easy readout. Its bright green laser lines provide up to four times better visibility than red lines to make your levelling easier – no matter where the job takes you. Supplied with: 4 x AA 1.5V LR6 Batteries, 1 x LB 10 Professional Universal Mount, 1 x Alkaline Battery Adaptor, 1 x Laser Target Plate and 1 x Pouch. Specifications: Accuracy: ± 0.3 mm/m. Self-levelling Range: ±4° Working Range: 20m Working Range of Laser Points: 10m (top), 10m