Northern Ireland is the smallest of the four countries of the United Kingdom in terms of both area and population, containing 2.9% of the total population and 5.7% of the total area of the United Kingdom.
If you are using a wireless mouse with a USB connector and a PS/2 keyboard, verify that the USB mouse is plugged in a USB port on the computer and that the purple keyboard PS/2 plug is connected to the purple PS/2 port on the computer.
The first and foremost tip to remember is turning the wireless devices (keyboard and mouse) off when not in use. Doing so improves battery life of a wireless keyboard to great extent. You can use the manual turn off method to switch off your mouse/keyboard when you are done for the day.