1,Remote technology: Infrared technology
2,The distance is about 8M between the infrared emitter and receiver
3,Dont keep any object in front of receiver between 45 degree
4,Use in windows operation system 98SE/2000/ME/XP/MAC 9.0 or above
5,When using windows 98SE for model with flash disk ,need to install the driver first
5, Laser distance: no less than 200 meters.
7,battery:3 buttons