Features: 1.USB3.0 Interface: USB3.0 interface, high speed data transmission, data reading and writing speed is higher than USB2.0, no driver, plug and play, equipped with Micro USB interface and Type?C interface adapter. 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 Decibels of Sound: The double pipe whistle is very loudly and easy to blow, delivering up to 120 decibels of sound, enough to be heard at long distances. 4.Multipurpose: U disk is suitable for outdoor activities such as hiking, fishing, camping, boating and also for lifeguards, pet dog training, etc. 5.Waterproof: U disk is designed with no beads inside, which is waterproof and can be used for calling teammates for help, signal transmission, and sports training outdoors. specification:Item Type: Flash Drive Material: Zinc Alloy Interface: USB3.0 (With Micro USB Interface and Type-C Interface Adapter) 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 1 x Micro USB Interface Adapter 1 x Type-C Port Adapter