I have buyed the sandisk memory card 128 gb at 3900 from amazon I have got the defective card so I have returned it to amazon after that I have got another one then I have it . It is the best one among the all the product which I have used in my past . This memory can transfer the files at 70mb per second and it can read 40mb per second which is soo good I am using this from past 30 days and my handset is also accecpt this memory card well and reads the files very good . I recommend you to use this memory card if u use to have a photo studio with high quality and perfect to create photos and vedios of the functions