The Makita 10.8V/12V MAX CXT Lithium-Ion Self-Levelling Cross-Line/4-Point Red Beam Laser (SK106DZ) gives the user a cordless solution for selectable horizontal/vertical cross reference lines plus 4-point required for level, align, plumb, and square applications. Depending on ambient light in the working environment, the SK106DZ has a line visibility range up to 25m and is detectable up to 80m with a Makita Laser Detector (sold separately). The SK106DZ has a bright 635 nm class II red laser with �0.3 mm/m = �3.0 mm at 10m for best-in-class accuracy. The laser line fan length spans past the 90 degree position to provide 180 degree horizontal and 160 degree vertical lines for full reference line coverage. For increased efficiency, self-levelling line stability is achieved in up to 3 seconds for increased productivity. For longer run time, all 10.8V/12V MAX CXT cordless tools are also compatible with the 10.8V/12V MAX CXT Lithium-Ion 4.0Ah battery (BL1040B sold separately). 10.8V/12V MAX CXT� lithium-Ion batteries are engineered with a Battery Protection Circuit that protects against overloading, over-discharging and over-heating. It's part of the expanding 10.8V/12V MAX CXT� series, combining performance with superior ergonomics in a compact size. Features Selectable horizontal/vertical cross reference lines plus 4-point required for level, align, plumb and square applications 10.8V/12V MAX CXT battery delivers the convenience of a rechargeable tool battery and up to 40 hours of continuous run-time (battery not included) Red line visibility range up to 25m depending on ambient light and detectable up to 80m with Makita Laser Detector Bright 635 nm class II red laser with �0.3 mm/m = �3.0 mm at 10m for best-in-class accuracy Laser line fan angle spans past the 180� horizontal line and 170� vertical line positions for full reference line coverage Fast self-levelling line stability is achieved in up to 3 seconds for increased productivity Self-levelling