JavaCard OS

Due to our project requirement, we may need to use Mifare card to manage time and unlock door(access control system). Now I just want to know which Mifare card to choose? Thanks for any recommendation.
By the way, we don't have high security requirement for this.

Almost all the common Mifare cards (Ultralight, Ultralight C, Classic 1K,etc) can fit your needs. It really depends on you. You can also try Mifare clone 1K card in this store, which can be cloned easily.