laser pointer

            Feature: USB plug-and-play. No driver required.
                          System: WINDOWS98/2000/ME/XP Linux & Mac OS
                          Technology: Radio Frequency 
                          Control distance: up to 20m
                          Working voltage: 3V
                          Sleep current: 1uA
                          Wavelength: 650nm
                          Max output: < 1mW or < 5Mw

Main Function : 1. Laser pointer
                          2. Page up/down
                          3. Mouse
                          4. PowerPoint display 
                          5. Blank screen
                          6. Clock
                          7. Self-definite timing alarm
                          8. Fixed timing alarm
                          9. Second counter
                          10. Built-in flash memory optional

It is special for any presentation of PowerPoint play.