Powerful Light Vertical Laser Level Self Leveling Horizontal Cross Laser Green Beams 2 Lines Construction Tool

Laser wavelength: 505-525 nm Working distance inside (line): 10-20 m Laser type: 2 lines green beam Size:as the picture Power supply:800mA AA ithium batter(not include) Package:1pcs Laser Level Instructions for use: This laser level does not contain a battery. Please pay attention to the position of the positive and negative electrodes when using the battery. Placing the wrong battery can cause the machine to be unusable. The black button on the side is a switch Note: WARNING Emits Laser Radiation - Avoid direct exposure of the laser beam to the eyes.