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The Logitech MX Master 3S is one of my favorite mice, and pairing it to a computer over Bluetooth takes about thirty seconds once you know where the buttons are. This is for anyone who just unboxed one, or who wants to connect it to a second or third machine. Here is the whole process.
Turn the mouse on and pick a device slot
Flip the mouse over and switch it on using the power slider on the bottom. On the underside you will also see a small button that cycles through three device slots. The MX Master 3S can remember up to three devices at once, so you pick which slot you want to assign before you start pairing.
Press that button until the slot you want is selected. In the video I set up the third slot, but the steps are the same for any of them.
Put the mouse into Bluetooth pairing mode
With your slot chosen, press and hold the same button until the light starts to blink quickly. That fast blink is the signal that the mouse is now in Bluetooth pairing mode and is broadcasting so your computer can find it.
Connect from your computer
Now head over to your computer and open the Bluetooth settings.
- Open your device’s Bluetooth settings and make sure Bluetooth is turned on.
- Look for the MX Master 3S in the list of available devices.
- Click it to connect.
Once it pairs, the light stops blinking and the mouse is ready to use. That is all there is to it.
A few extra tips
If the mouse does not show up, double check that you actually held the button long enough for the light to blink quickly. A slow blink or a solid light means it is not in pairing mode yet.
Because the MX Master 3S holds three separate connections, you can keep it paired to a laptop, a desktop, and a tablet at the same time and switch between them with that same bottom button. If you ever want to move a slot to a different computer, just repeat these steps on that slot to overwrite it.
