|Just for info, testing batteries with a voltmeter is only any good if a load is present. In this case with the mouse on and running. Off load they can be nearly dead yet still give quite a convincing reading. A torch bulb can be a suitable load for single cells.|
As for the button on the sending and receiving unit (wireless unit), this usually exists in order to synchronise the mouse and wireless unit to the same channel. Sometimes there is one on the mouse itself too.
Have you tried another mouse - could have died.
Always pop back and let us know the outcome - thanks
message edited by Derek