Exact compatibility first
Look for the actual certification and ecosystem support for the model being purchased.
Check recurring costs
Video history, advanced automations or monitoring may require subscriptions.
Ask what happens offline
Some core controls may remain local while cloud-only features stop.
Check end-of-life implications
A cheap device can become expensive if vendor support disappears and the product becomes unusable.
Keep in mind. Compatibility is not permanent. Confirm the current manufacturer, platform and certification information before purchasing, resetting or migrating a device.