Eve Motion is easy to setup, but you should read the Get Started Guide.
Here it is, in PDF form.
Eve Motion - Get Started Guide (PDF)
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Eve Motion detects movement, allowing you to automatically set scenes and control your connected accessories when you enter or exit a room.
1) Download the Elgato Eve app from the App Store.
2) Insert the included AA batteries and find a good spot for Eve Motion. Please be aware of the Operating Ranges, which should influence where you place it:
Operating Range of Movement
3) Open the Elgato Eve app and tap Add Accessory. Eve will now guide you through the setup process.
If you have already set up another accessory, go to the Eve settings to add Eve Motion to your home.
HomeKit Setup Code
Please keep your HomeKit Setup Code in a safe place. You need it to securely add Eve to your home, and nobody but you has a copy.