This is a lithium battery for Huepar B03CG/B02CG/B21CG laser level only. Laser Classification: The tool is a laser class 2 laser product according to IEC/EN60825-1/2014. It is allowed to use unit without further safety precautions. Eye protection is normally secured by aversion responses and the blink reflex. The laser tool is marked with class 2 warning labels. Note: WARNING Emits Laser Radiation -Avoid direct exposure of the laser beam to the eyes.