Your Unifying USB receiver can be paired with up to six Unifying devices at a time. You can determine if your Logitech devices are Unifying by this logo: 
There are two ways to connect your M720 Triathlon mouse to the Unifying receiver:
Use Logitech Options Software
You can use Logitech Options to connect to the Unifying receiver for your mouse. If you don't already have it installed, you can download Logitech Options from the M720 Triathlon Downloads page.
Use Logitech Unifying Software
There are two ways to connect your M720 Triathlon mouse to the Unifying receiver:
Use Logitech Options Software
You can use Logitech Options to connect to the Unifying receiver for your mouse. If you don't already have it installed, you can download Logitech Options from the M720 Triathlon Downloads page.
- Launch the Logitech Options Software:
Windows: Start > Programs > Logitech > Logitech Options
Mac: Macintosh HD > Applications > Logitech Options - If this is the first device to pair with your Unifying receiver, click Add Device.
- If you already have one or more devices paired, click Your Devices, and then click Add Devices in the bottom right corner of the window.
- On the Add a device window, under Set up a Unifying device, click Add Unifying device.
- On your M720 mouse, select one of the channels you want to pair to (1,2 or 3) by pressing the adjacent button multiple times until the channel number is lit. Once lit, hold down the button until the light starts flashing rapidly.
- Follow the on-screen instructions to turn your device off and then back on.
- If the pairing was successful you will see a Pairing completed confirmation window. Click Done in the bottom right corner to close the window. The channel light on the mouse will turn solid for a few seconds before it turns off.
Use Logitech Unifying Software
- Launch the Logitech Unifying software:
Windows: Start > Programs > Logitech > Unifying > Logitech Unifying Software
Macintosh: Application > Utilities > Logitech Unifying SoftwareNOTE: If you don't already have it installed, you can download Unifying software from the M720 Triathlon Downloads page.
- At the bottom of the Welcome screen, click Next.
NOTE: These instructions use Windows screenshots. Macintosh will look slightly different, but the instructions are the same. - On your M720 mouse, select one of the channels you want to pair to (1,2 or 3) by pressing the connect button until the channel number is lit. Once lit, hold down the button until the light starts flashing rapidly.
- When you see the "Restart the device…" screen, follow the on-screen instructions to turn your device off and then back on.
- When your device is detected, you'll see a "We have detected your…" confirmation screen. If you connected a:
- Keyboard: Type a test message in the field provided to make sure it works.
- Mouse: Move it around to see if the cursor moves with it.
If your device doesn't respond immediately, wait a minute to see if it connects. If the device is still unresponsive, then select No and then click Next to restart the pairing process from Step 1. - Click Finish to exit the Logitech Unifying Software (or click Pair Another Device to pair additional devices). Your device should now be connected.
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