I had paid 18 PAIDF. It allows to play movies or music by connecting the tip to the MicroUSB MicroUSB port of my Huawei Mate 7. This avoids too often fill the internal memory of mobile or MicroSDHC memory card. And with its standard USB connector, you can use it as a standard USB key. Well, we must be content transfers via USB 2.0, but considering the price not complain. The design is nice and the tips are protected by their plastic cover.