1USB2.0 Interface: No need for a driver, plug and play. Universal compatibility, with our premium USB flash drives for Windows/for OS and many other devices, you can easily transfer data or content with fast plug and play functionality. 2With Adapter: Compatible with more different interface devices, interface: USB2.0 (equipped with Micro USB interface and USB C interface adapter). Write speed: 4MB/s (related to computer configuration), read speed: 12MB/s (related to computer configuration). 3Multipurpose: It can be used as a USB flash drive and can also be used as an emergency survival whistle. It is suitable for outdoor activities, such as hiking, fishing, camping, boating, hunting, and is also suitable for lifeguards, pet dog training, etc. 4Outdoor Whistle: Small and easy to carry, no bead design, waterproof, can also be used in water, outdoor call for help, signal transmission, sports training. Super exclamatory: The double pipe whistle is very exclamatory and easy to blow. Acoustic energy delivers up to 120 decibels of sound, enough to be heard at long distances. 5High Quality Material: Made of aluminum alloy material, strong and durable. Easy to carry, it comes with a keychain and can be attached to a backpack, belt or hung around the neck. Portable keychain, sturdy and durable/small and easy to carry/strong keychain. Item Type:USB Flash Drives Product Material: Aluminum Alloy Interface: USB2.0 (With Micro USB Interface and USB C Interface Adapter) Write Speed: 4MB/s (Related to Computer Configuration) Read Speed: 12MB/s (Related to Computer Configuration) Compatible: forWindows/for OS Product Size: Approx.68 x 15 x 7.5mm / 2.7 x 0.6 x 0.3in Ultra portable Storage Devices: Replacing forWindows/for OSCompatible Floppy Disks and CD 1 xFlashDrive 1 x Micro USB Interface Adapter 1 x USB C Interface Adapter