1、USB2.0 Interface: This USB flash drive adopts USB2.0 interface and requires no drivers, supports plug and play function. 2、Multi Purpose: This USB flash drive features whistle function design, suitable for outdoor activities, such as hiking, fishing, camping, boating, hunting, also suitable for lifeguard, pet dog training, etc. 3、Stable Transmission: This USB flash drive provides safe, stable and fast transmission, suitable for Win, OS X and other devices. 4、Mini Size: This USB flash drive is mini and portable, double tube whistle is very resounding and easy to blow. Providing sound of up to 120 decibels, enough to be heard at a distance. 5、Aluminium Alloy: Made of aluminum alloy, strong and durable. Equipped with key chain and lanyard, can be attached to a backpack, belt or around the neck. Item Type: USB Flash Drive Material: Aluminium Alloy Interface: UBS Compatible With: For Win, for OS X Product Size: Approx. 68 x 15 x 7.5mm / 2.68 x 0.59 x 0.30in (Manual Measurement, Slight Error May Exist) Function: Ultra Portable Storage Devices That Replace Floppy Disk and CD compatible with Win or OS X 1 x USB Flash Drive