Push the little red "connct" button on both the bottom of the mouse as well as the wireless receiver. If that does not work try referring to the quick start guide here.
Press the button on the back of the mouse to free the battery cover on top.
Remove the battery cover and put the supplied AA battery into the mouse.
Replace the battery cover.
Insert the wireless USB dongle into a USB port on the laptop or desktop computer.
Move the mouse and watch your computer screen.
Confirm that the mouse is connected by making the cursor move.
Hope this helps
Examine the rear portion of the Microsoft Wireless 3000 mouse (the part where the base of your palm rests). Look for a silver button marked "Microsoft."
Press the "Microsoft" button. This button is actually the battery-door release. When you press it, the battery door pops open on its hinge.
Remove the old batteries, using the tip of your finger to gently pry them out.
Insert the left-side battery. The "Positive" post on this battery should be facing the back half of the mouse.
Insert the right-side battery. The "Positive" post on this battery should be facing the front of the mouse. Push the battery cover straight down to close it.
hope it helps
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