Please download the app software before use (refer to instructions). The device will not function without downloading the app. If the plug does not respond, ensure your phone is not using a protective case that may block the connection. Free download the app (UTools) from the app store by searching for it. devices only work with this app. Android devices support plug and play and do not require any application installation. About Capacity: 32GB = approximately 31.2GB; 64GB = approximately 62GB; 128GB = approximately 124GB to 128GB. Flash memory vendors use decimal arithmetic: 1MB = 1000KB, 1GB = 1000MB. Operating systems use binary arithmetic: 1MB = 1024KB, 1GB = 1024MB. Therefore, there is a difference between displayed capacity and nominal capacity of flash memory products. Function: Recording: iOS system does not allow direct file transfer between apps, but files can be transferred out via email. Now you can transfer data without network connectivity using the recording function of the iFlashDrive. One-touch contact backup: The iOS system does not support direct backup of contacts without a computer or network. This device enables backup and restore operations easily and without network access. Mobile office: Supports copying, deleting, moving, and editing files. With compatible iOS software, documents on the flash drive can be quickly modified and shared via email or mobile data. Enables portable and efficient office work. Supports PDF, Word, Excel, PPT, HTM, HTML, and other file types. Take photos/videos directly to the flash drive: Capture photos and videos using your and save them directly to the flash drive. Play videos/music: Play video and o files stored on the flash drive. Supported video formats: MP4, MOV, RM, RMVB, M4V, FLV, WMV, AVI. Supported o formats: MP3, AIF, WAV, AAC, WMA, etc. Capacity options: 16GB, 32GB, 64GB, 128GB Color options: Silver, Black, Gold, Rose Gold Compatibility: 5, 5S, 5C, 4, Air, Mini, Mini 2, Mini 4, Air 2, iPod Touch 5, 6, 6S, 7, 7 Plus, Mac Operating System Compatibility: Windows 98 / 2000 / XP / Vista / 7 / 8 / 10, Macintosh OS 9.x or later, Linux Kernel 2.4 or later Android compatibility: Devices with OTG function (please confirm your device supports OTG and maximum capacity supported) Dimensions: 52 x 22 x 8mm Interface: Lightning, Micro USB, and USB 3-in-1 Operating temperature: 32°F to 140°F (0°C to 60°C) Storage temperature: -4°F to 185°F (-20°C to 85°C) How to use: For and : Install the free app from the App Store. For Android smartphones: Plug and play, no app required. Step 1: Plug into the phone. The screen will prompt you to download the app. Follow on-screen instructions, or search the App Store manually (instructions included in package). Step 2: Install the app. Step 3: Open the connected app to back up or transfer your files. Package includes: 1 x USB stick