Please download APP software before use(Look at the instructions), not to download APP is not available,If the plug did not respond please look at the mobile phone is a protective sleeve, there can be takenFree Download App(UTools),Please go to the app store to search and download (iPhone Only work by this App).Android devices, plug and play, do not need to install applications and programs.About Capacity:32GB=31.2GB; 64GB=approximately 62GB;128GB=approximately 124GB--128GB Why the USB flash drive real capacity is not correct capacity.Flash memory vendors are using decimal arithmetic:1MB = 1000KB,1G = 1000MBCalculated, the operating system using binary arithmetic:1MB = 1024KB,1GB = 1024MB; So there are some differences between display capacity and nominal capacity of flash memory product.Function:Recording: Apple IOS itself system cannot be directly removed the tape with each other , only can transfer out by Email: Now you can put the data transfer out without n etwork as long as usin g the recording function of iflashdrive.A key contacts backup: Apple ios system cannot be backup directory,even can't removed backup in the case of no computer n etworkBut iflashdrive can realize to backup and restore The operation is simple without n etwork.Mobile office: You can select files to copy, delete, move, and edit the support files.With the software of Apple IOS system can rapid modified the document in flash drive, and can transfer out by Email or 3G at anytime. Make your office work portable and shortcut. Support PDF, Word, Excel, PPT, HTM, Html, etc.Take photo / video on the flash drive: You can take pictures and video with iphone and store it in the flash drive.Play videos / music: You can play the videos / music on the flash drive. Video Support: Mp4, Mov, RM ,RMVB, M4V, FLV, WMV, AVI. Music support: Mp3, AIF, WAV, AAC, WMA, etc.Capacity:16GB, 32GB, 64GB, 128GB(optional)Color: Silver, Black, Gold, Rose Gold(optional)Compatibility with: iPhone 5 / iPhone 5S / iPhone 5C