How to pair Leo with Mac OS

From the Apple menu, select System Preferences.
Click the Bluetooth icon.
Click the Settings tab

Check the Discoverable checkbox and the "Show Bluetooth status in the menu bar" checkbox.
(Later, you can turn Bluetooth on by going to the Bluetooth status in the menu bar.)
Click the "Turn Bluetooth On" button.
Close System Preferences.

Set up your Leo. (Bluetooth on your Mac must be on during these steps.)

Turn on your Leo (press and hold power button, it will flash blue twice then turn solid blue, release button).
From the Apple menu, select System Preferences. Or click the Bluetooth icon. Click the Devices tab.
Select 'Arriva Leo' (it should be displayed in Bluetooth devices; give that a moment to show up and name itself properly).

Click the "Set Up New Device" button.
Follow the Bluetooth setup assistant instructions for your headset.
If asked for a Passkey use 0000

Select "headset" when the assistant asks what type of device.