Logitech MK235 Wireless Keyboard + Mouse Kit, USB, Grey Long battery life You can use the keyboard for up to three years and the mouse for about a year before replacing the battery. The duration of use may vary depending on the conditions of use. You just need to connect the small receiver to get a strong connection. The keyboard and mouse can be used up to a distance of 10 m. Dimensions: - Keyboard: 435.5 x 137.5 x 20.5 mm - Mouse: 97.7 x 61.5 x 35.2 mm - Receiver: 18.7 x 14.4 x 6.6 mm Weight: - Keyboard: 475g - Mouse: 70.5g - 2 g.