TECHNICAL DATA Cord length: Not applicable Number of batteries: 4 Number of media buttons: 4 Buttons: 3 Mechanism: membrane Warranty (months): 24 Battery type: AAA PCI / DPI resolution: 1000-2200 Sensor: optical Key drop: Low profile keys Technology: 2.4 GHz Keyboard type: thin Max. range (m): 10 Compatibility with operating systems: Windows XP / Vista / 7, Mac OS Plug: USB Nano Receiver: Yes