Special keys allow to control CD-Rom player and the volume in order to have an easy listening of the audio supports. The Software which is included gives visual indications of the Caps Lock Num Lock and Scroll Lock and of the signal level received, for the batteries state indication. PLUS INPUT DEVICES Smart Desktop A04-W1102 Wireless Technology RF 27 MHz 105 + 18 functional keys keyboard Single connection USB for keyboard and Mouse Auto installing without driver Windows® 98/ME/2000/XP compatibi