I bought a broken gaming mouse which had a faulty scroll wheel as a diy upgrade from my original mouse. When I cut the tape the mouse unravelled from the bubble wrap and landed on the floor. I tried to get the mouse to connect to the pc but nothing happened. After about 10 minutes I realised that on the bottom of the mouse had an on switch. I turned it on and the mouse worked perfectly. So good in fact that dropping the mouse fixed the scroll wheel. Highly recommended as a cheap mouse upgrade.