Logitech MK850 Multi-Device silent Wireless Keyboard & Mouse Sets (1) Product List Wireless Keyboard Wireless Mouse Unifying receiver 2 AAA batteries for keyboard, 1 AA battery for mouse (pre-installed) User documentation (2) Technical Specifications Keyboard Connection type: Bluetooth Smart with 2.4GHz wireless connection Wireless range: 10 meters Wireless Encryption: Yes Battery details: 2 x AAA batteries Battery: 36 months 2 Million Keystrokes Mouse (3) Connection Type: Bluetooth Smart with 2.4GHz wireless connection Wireless Range: 10 meters (4) Battery Details: 1 x AA Battery Battery: 18 months Sensor Technology: Logitech Advanced Optical Tracking Technology Sensor Resolution: 1000 DPI Scroll Wheel: Sprint Number of buttons: 8 Custom Apps: Powered by Logi Options+ for Windows and macOS 6Support for Windows and macOS