Logitech MK850 Performance Keyboard & Mouse Combo - Bluetooth & 2.4 GHz Wireless
Connection Type: Bluetooth® Smart and 2.4GHz wireless connection
Wireless range: 10 m
Wireless range may vary depending on operating environment and computer setup.
Wireless encryption: Yes
Wireless encryption is between keyboard and the connected computer or mobile device.
Battery Details: 2 x AAA