LOGITECH MK220 Keyboard & Mouse SETS (1)Specifications and details Keycap Material: ABS Power supply: dry battery Keycap Characters: Laser engraving process Key structure: Other Battery capacity: 999mAh (2) Packing list Keyboard (K220), Mouse (M150), USB Receiver / Battery, User's Manual (3) Product Description Shaft type: Shaftless Number of keys: 81-90 keys Connection Type: Hot Swap not supported Compatible System: Windows Backlight effect: No backlight Connection method: Wireless Simultaneously connected devices: 1 (4)Keyboard parameters Size: about 380*114*21 mm Keyboard: Compact Battery life: Approx. 24 months Features: Simple and compact / splash-proof (5) Mouse parameters Dimensions: approx. 60*107*38 mm Sensor: Light effect tracking technology Battery life: approx. 5 months Resolution: 1000 DPI (6) System Requirements Windows Vista, Windows XP, Win7, Win8, Win10