Green laser pointer is 8x brighter than red laser which is clearly visible against most backgrounds except for LCD display. The laser is strictly complies with IEC-60825-1 Class 2 safety standardUp to 330 feet of wireless control range due to advanced data loss control algorithms designed by our own R&D teamFeatured functions of this Presentation Clicker includes Hyperlink Volume Control. Except for Backward Forward Full/Black Screen Key-function is customizable via Norwii Presnter softwareBuilt-in 360mAh long-lasting lithum battery. Fully charged in 2~3 hours and can work for weeksMultiple options for the same look: black with green laser pointer black with red laser pointer white with red laser pointer