Mr Hossam, he was asking what are the features and I think that ypu didn't give him a respondI paid and it works,
BUT YOU SHOULD KNOW THAT: the videos are not finished, for example in the japanese language there is only 4 video up to now
The features are: you can pass more than 2 videos per day, there is another one that lets you to have an unlimited number of flashcards( as I know ) but it doesn't work on my phone.
Also there is a coming soon feature wich is you will be able to ask the teachers but it isn't activated yet