Features:Supports hot plug & play, High speed USB 2.0 portNo physical drive required Plug-and-play; no external power supply required, USB bus-poweredSupport all current computer systemsspeeds vary depending on types of file being transferred and computer configuration.Read Rate: 12Mb-18Mb/S Write Rate: 4-6 Mb/SInterface USB 2.0Interface Type: USB 2.0 otgEnvironment Temperature: -40C - +70CStorage Temperature: -50C - +80CUSB Service Voltage: 4.5V-5.5Vstorage capacity:4G 8G 16G 32G 64G Pen Drivecolour:Black,White,Blue,Yellow,Green,Purple,Red,PinkExcellent USB Memory stick in excellent condition About capacity:Is the usb flash drive real capacity? Sure, our usb flash drive is the actual capacity, you can use the h2text to send it.H2text is the most authorized testing software in the world. If you need this software, we can provide it for free. 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-120GBVendors 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