Features: 1.USB3.0 Interface: USB3.0 interface, high speed data transmission, data read and write speed is higher than USB2.0, no drive, plug and play. 2.Universal Compatibility: USB flash drives for Windows, for OS X and other devices, you can easily transfer data or content through fast plug and play functions. 3.120 Decibel Sound: Outdoor whistle, S0S, double tube whistle is very loudly and easy to blow. It can provide up to 120 decibels of sound, which is enough to be heard at a long distance. 4.Multi Purpose: U disk can be used as a U disk at the same time as an emergency survival whistle. It is suitable for outdoor activities, such as hiking, fishing, camping, boating, hunting, lifeguards, pet dog training, etc. 5.Zinc Alloy Material: Flash drive is made of zinc alloy material with no beads inside and is waterproof. Equipped with a key chain and sling, it can be tied to a backpack, belt or hung around the neck. specification:Item Type: Flash Drive Material: Zinc alloy Interface: USB3.0 Compatible: For Windows, for OS X Size: Approx. 68 x 15 x 7.5mm / 2.7 x 0.6 x 0.3in Function: Ultra Portable Storage Device Replaces Floppy Disks and CDs Compatible with for Windows, for OS X PackageList:1 x FlashDrive