How do i fix my cordless mouse with the cursor shaking all over?

Have microsoft keyboard and mouse with a receiver on desk. I have changed batteries (duracell) it hasn't stopped the problem. Also changed mouse mat as saw to do that.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia��).