This FileKing OTG USB Flash drives provide additional storage in a small, convenient form factor for tablets and smartphones that support the USB OTG (On-The-Go) functionality. It allows you to Quickly and easily transfer your files between OTG-enabled Android smartphones. tablets and computers, and it makes it easy and fast to free up space for photos, videos, songs, and more.Feature: 1. Interface: USB 2.0 2.Storage Lifetime: More than 10 years of durable data storage 3.Use A-class chip, can be erased repeatedly for 100,0000 times 4.Easy to read and write in high speed ,no need drive/power supply only plug in Quality testing: All of our products will be tested before shipping. 1.How to connect to mobile phone? There are two ways to transfer data to this USB flash drive due to the different phones. Way 1: 1.Connect the USB flash drive to your phone, and glide your finger downward on the phone's home screen to display the notifications panel. 2.Tap the information as "General USB Drive", “USB storage” or “OTG” alert, you will see some existing folders . 3.Click the folder to open the files, choose the files to “copy to” or “move to” the folder you want to. Glide your finger downward on the phone's home screen to display the notifications panel to back to the “General USB Drive” to eject or uninstall the flash drive. Way 2: 1.After you plug it into your phone, look at the top of your phone for the USB symbol, it says “USB storage” connected. Go to "My Files" to select the videos, pictures or audios you will see your files there. 2.Click on “Copy” or “Move” by breaking down menu on the top right corner, then go to the folder you want to move your files to. At the top/bottom you will see 'Paste Here', once you do that, your files will be copied or moved to that folder. 3.Glide your finger downward on the phone's home screen to display the notifications panel to back to the “General USB Drive” to eject or uninstall the flash drive.About capacity: 4GB=approximately 3.6GB-3.8GB8GB=approximately 7.4GB-7.6GB16GB=approximately 14.4GB-14.8GB32GB=approximately 28.5GB-30GB64GB=approximately 58.5GB-60GB128GB=approximately 110.5GB-120GB Vendors are using Flash memory decimal arithmetic: 1 MB = 1000KB, 1G = 1000 MBCalculated, operating system with binary arithmetic: 1 MB = 1024KB, 1 GB = 1024 MB;So there are some differences between display capacity and nominal capacity of flash memory products Package included: 1 X USB Flash DriveAttention: To avoid data loss or mechanical damage, do not power down your computer or unplug flash disk during transfer.Please do not remove your USB flash drive when it is being used otherwise your data may loss. After using USB flash drive, it is better to remove it as soon as possible. That will helps to extend its storage lifetime.    Please do not format your USB flash drive frequently, otherwise the USB will be damaged easily.