Mini Metal USB Flash Drives Silver Business Gift Memory Stick Custom logo Pen Drive Waterproof Storage Devices 8GB 16GB 32GB 64GB External storage Free custom logo U Disk Features: ● USB 2.0 interface with higher speed and higher stability ● Portable, lightweight, high-quality metal protects the connector ●Environment Temperature: -40°C - +70°C ●Storage Temperature: -50°C - +80°C ●USB Service Voltage: 4.5V-5.5V ●Storage Lifetime: More than 5 years ●Use A-class chip, can be erased repeatedly for 100,0000 times ●Operating System: Win98/ME/2000/XP/ Vista/win7 /win8, Mac OS 9.X/Linux2.4 or above ●USB connection: support Hot plug & Play. ●Easy to read and read in high speed, no need drive/power supply only plug in 1.USB connection,support Hot plug & Play. 2.No external power supply . 3.Support different types of os. 4 .Solid State Storage, Shock proof and electromagnetic proof 5. Fast speed in write/read transfer. 6.Hardware Requirement: PC with USB connection,Notebook,MAC. 7.Capacity:8GB/16GB/32GB/64GB About real capacity 8GB = approximately 7.4GB-7.8GB 16GB = approximately 14.2GB-15GB 32GB = approximately 28GB-30GB 64GB = approximately 58GB-60GB This is calculation difference between manufacturer and your PC, please Google 'Memory card capacity' to get more information. Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1 GB = 1.00 Billion bytes.The pursuit of the perfect person is not recommended to buy.