From Amazon.com: "The Bosch GLL50-20 Self-Leveling Cross-Line Laser features a 50 feet range and cross-line mode that projects both horizontal and vertical red lines, allowing for leveling with a 5/16 inch accuracy at 30 feet. With its power flexibility, operate using ... AA batteries or purchase Bosch's 3.7V Lithium-Ion 1.0 Ah battery ... that allows use of the tool while charging to diminish downtime. Its ergonomic, compact, lightweight design and IP55 dust- and water-resistant rating provide for both comfortable and dependable operation. The full rubber overmold housing helps protect every major impact point, acting like a roll cage for safe-guarding. Equipped with a Smart Pendulum System, the tool self levels, will indicate any out-of-level condition by blinking and then locks when switched off for secure transport. Simply tilt the laser to use the lines at an angle with ease. Position the tool with the included integrated magnetic mount or utilize the 1/4 inch threading mount that fits with like-sized tripods."
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