How to enable motion alerts

so i want to enable motion alert on my doorbell pro but when i press the on button is says unavailable. yes i live in the US

Hi @joah. The Motion Warning feature is being rolled out incrementally for selected Ring devices. The Motion Warning feature is not available on battery-powered devices, even if the devices are connected to external power. If you have an eligible device (listed below) but don’t see the feature, make sure you have the most current version of the Ring app. If you need to know how to update your Ring app, use this link for instructions. Let me know if that helps.