About Connection
First, try changing the batteries to ensure the mouse is not in a low-power state. It is recommended to unplug other receivers and then try to re-pair.
Re-pairing steps:
Remove the receiver from the computer, turn on the mouse switch, and then press the left, right, and middle (scroll wheel) buttons of the mouse for more than 5 seconds. Quickly insert the receiver and place the mouse close to the receiver.
Replace the batteries with those from a well-known brand. Click any button and see if the laser light at the bottom lights up. If it does but the mouse still doesn't work, try re-pairing.
About Buttons
First, change the batteries and then press the buttons firmly. It is also recommended to connect the mouse to another device to see if it can work normally.
About the Scroll Wheel
Wipe the scroll wheel with alcohol and then blow off any debris from the scroll wheel using a hairdryer.
First, clean the scroll wheel. Try changing the batteries and re-pairing. It is also recommended to connect the mouse to another device for testing.