Model Number: HCG400 Brand Name: Hawk Key Specifications/Special Features: One button press changes the screen to black, easy to control conference progress.Volume control - control computer background music volumeAlt + tab function to change different screensWith hyperlink functionLED light flash to indicate low power Power-off automatically while the receiver is stored in presenter.Laser indicator: green laserControl distance: 30mLaser power: <5mWBattery: AAA x 2pcsSupport system: Mac OS X v.10.4 (or above), Windows 98/SE/ME/2000/XP/Vista/7Color: black