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+# [Documentation](/help) - What You Need
+If this documentation was not useful enough for you, feel free to ask any question in [HA Client on Descord](https://discord.gg/nd6FZQ)
+
+- [Home Assistant](#home-assistant)
+- [Android](#android)
+
+## Home Assistant
+Of course you need [Home Assistant](https://www.home-assistant.io/) to make HA Client work. The version of Home Assintant should be **0.104** or higher.
+
+To connect to your Home Assistant instance with HA Client you need `mobile_app` component to be enabled. If you have `default_config` in your `configuration.yaml` you don't need to add anything. If not - just add (or check if exist) this line to your `configuration.yaml`:
+
+```yaml
+mobile_app:
+```
+
+Also to make HA Client work outside of your home network [remote access](https://www.home-assistant.io/docs/configuration/remote/) should be configured or [Remote UI](https://www.nabucasa.com/config/remote/) should be used.
+
+[Back to top](##documentation---what-you-need)
+
+## Android
+Minimum supported Android API level is 21. That’s **Android 5.0** and higher.
+[Back to top](##documentation---what-you-need)
+Next: [Connection](/help/connection)