Mobile Hard Disk USB3.0 /1TB-BlueA practical external hard drive is a traditional internal hard disk drive (HDD) in a convenient external format so you can easily expand storage capacity without touching your computer’s internal functions. These units also allow you to quickly create file retention solutions or download bulk files for simple transfer to another computer. Hard drives are usually relatively cheap and can give you a lot of storage space. feature: 1) Elegant, thin, easy to use and very flexible protection for your files 2) Portable external hard drive 3) Provide practical portable storage 4) Easy to carry with you 5) Portable additional storage with USB 3.0 power supply, compatible with USB2.0 6) Plug and play, easy to use, no need to install software 7) Provide ample storage space for your music, movies and other files 8) Internal crash sensor and ramp charging technology to protect your device and data descriptionInterface: USB 3.0 storage Capacity: 1TB (Note: The capacity is not expandable) Color: as picture shown Operating temperature: 32°-140°F (0°-60°C)Packing list: 1 Expansion Portable External Hard Drive 1 USB cable9) The transmission speed is 20mb/s Note that it is not a high-speed transmission hard drive, so you can consult first when purchasing.