1[Unique Design] Anti vibration, moisture proof, high and low temperature resistance, anti electromagnetic interference, small and easy to carry. 2[Selfprotection] This USB flash memory stick adopts 0 track protection and automatic anti virus, so you can use it with confidence. 3[Easy operation] Using the USB interface, this U disk does not need a drive, it is plug and play, hot swappable, and easy to operate. 4[2 in 1 Design] Streamlined appearance, raised face design, make the appearance of the U disk more personalized, and can also act as a whistle. 5[Long Service Life] The insertion end of the U disk is equipped with a protective cover, which is waterproof and wear resistant, has a long service life.Item Type: Flash Drive Material: Zinc Alloy Whistle Volume Decibel: Above 120dB Speed: USB2.0 Status: Write Speed: 4MB/s, ReadSpeed: 12MB/s (Related to Computer Configuration) Interface: USB Interface, No Driver Required, Plug and Play, Hot Swappable Boot: Support USB ZIP/HDD Boot. Power Source: USB Bus Power Supply (4.5V~5.5V) Data Preservation: Data is Preserved for at Least 10 Years Applicable Models: PCs of Various Brands and Compatible Computers, for Macintosh, for PowerBook, for OS X or for iBook. Operating System: For WIN7, for WIN8, for WINXP, for Windows 98ME2000XP, etc. Working Current: 1 xFlashDriveManufacturer standard: 1GB=1000MB / 1MB = 1000KBRegarding usable capacity: Please note the memorandum regarding storage product capacity:4GB=Approx. 3.4GB3.8GB8GB=Approx. 7.4GB7.6GB16GB=Approx. 14.5GB15.5GB32GB=Approx. 28GB30GB64GB=Approx. 58GB60GB128GB=Approx. 119GB124GB256GB=Approx. 249GB250GB512GB=Approx. 498GB500GB