You can add iOS or Android devices to your AirDroid account as you like.
For free users, you can only add 2 devices to your account.
For premium users, you can add 3 devices to your account for free, if more device quota needed, you can pay an exact fee to extend the device quota to maximum 10 devices.
To use the features like Remote Control, Notification, SMS, Remote Camera under remote connection, you should Enable the related remote permissions via Android AirDroid app > Me > Security & Remote Features.
Major Features of AirDroid
*If you have commercial needs: Deployment and management massive unattached devices remotely, you can try our enterprise product - AirDroid Business
If you want to mirror your phone screen to your computer, you can use Screen Mirroring on AirDroid desktop client or on AirDroid Web Clent ()
Mirror your phone's notifications
Messages/Contacts/Photos/Videos/Ringtones/Files/Call Logs/Apps Management
You can use AirDroid under local connection or remote connection. But if you use them under remote connection, it will consume the remote data quota. For free account, the maximum remote data quota is 200MB/mon. If you would like to own unlimited remote data quota, you can upgrade your account to Premium.