Wireless Presenter Specifications: Transmitter Technology: Radio Frequency Frequency: 2.4GHz Control Distance: 100m Class 3R Max Output: Distance: >200m Wavelength: 650nm Battery: AAA*1 Working Voltage: 1.5V Dimension: 139.2*18.2*19.7mm Weight: 25g USB Receiver Operation System: Windows 2003, XP, Vista, Windows 7/8, Mac OS, Linux Dimension: 21.95*13.8*7.15mm Weight: 2g Safety Warning: Be warned that 2.4GHz pointers are not toys; they should never under any circumstances be directed into people's eyes or at passing aircraft. The pointer is not a toy and should not to be used by anyone under 21 It is illegal to direct the beam at any flying objects, moving vehicles and any public or private structures A pointer should not be directed at people or animals A pointer can be dangerous if not used properly