<br><b>SPECIFICATION:</b> <br> Laser wavelength: 520-535nm, <1mW <br> Indoor working distance: 132ft- 200ft <br> Laser Class: Class ǁ <br> Working temperature: -15℃to50℃ <br> Auto level range: ±4° <br> Accuracy:±1mm/7m <br> Power Supply: Li-ion battery/DC charger <br> Battery Hours: 6h <br> Screw adaptor: 1/4” <br> Transport lock: Yes <br> Individually shiftable function: Yes <br> Out-of-level indication: Optical signal/Audible <br><br><b>Please Note:</b> <br> -Do not look straight at the laser light. <br> -Avoid using laser in dark areas. Ensure sufficient lighting to avoid causing damage to eyes -Do not disassemble and repair the line level by yourself. <br> -This instrument complies with demands of the laser radiation safety standards. <br> -Please check all the parts are included in the packing when received the product, if you find any part is missing or damaged, kindly contact seller or amazon for help at first time. We provide 2-year factory warranty for this product from the date of purchased.