... light beam small shape,light weight low power expending laser guiderDirection pointer, orientation and collimationwidely used to road, ... and reliable featureseasy to install and use.Main specificationItemSpecificationEffective range>800mOutput power≥5mWFacula diameter≤70mm (Apart at 800m)Working ... power supply Coal Mine laneway localizer, collimator, laser guider, laser pointer, direction indicator