Square Laser:- Generate 2 line at Right Angle (90 Degree)- Ideal for floors, tiles, paneling, wall fixtures, wallpapering, stencilling, wainscoting, finish carpentry and more.- Simple one button operation powers two perpendicular laser lines (90 degrees) on and off.Feature:- Laser Level Square an easy to use layout tool- Projects horizontal and vertical laser "chalk lines" on surfaces- Dual diodes for making 90 degrees laser beam on any surfaces- Two bubble vials- Two suction cups allow the laser level square to be mounted onto the surfaces- alignment guide for 90-degree layout-calculate and turning angles in 5-degree increments- layout and partition installation.Specification:Laser wavelength:635 nmLaser class:Class IIAnti-dust Anti-water:IP-54Accuracy:+/-3/8"/100ft.(+/-1.5mm/5m)Self-leveling range:+/-4 degreePower :3 x AA alkaline batteries(NOT Included)Low voltage indication:Power LED flashingSize:116x68x115mm