Smare otg USB Flash Drive Pen Drive Smartphone 8GB/16GB32GB/64GB Pen Drive USB 2.0 Flash Drive for smart phone Product Description: High read/write Speed USB Service Voltage: 4.5V-5.5V Environment Temperature: -40°C – +70°C Storage Temperature: -50°C – +80°C Storage Lifetime: More than 10 years Operating System: Win98/ME/2000/XP/ Vista/7 , OS 9.X/Linux2.4 Convenient to carry Easy to read and read in high speed No need drive, only plug in No need power supply Support USB ZIP/HDD startup Small style and fashionable Shock resistance, damp proof, lighting resistance, antimagnetic endure impact and knock of 3 meters fall Use A-class chip, be erased repeatedly for 100,0000 times Compatible with PC, notebook,smartphone Interface: USB2.0 For Customers: 1.what is the write speed ? our USB flash drive write speed is 5M/S — 10M/S or you will lucky to get 11M+. if you want to save 1GB film in our USB flash drive,that you need the time is 2 mins,it save your time. 2.Why the USB flash drive real capacity is not correct capacity? Flash memory vendors are using decimal arithmetic:1MB = 1000KB,1G = 1000MB calculated, the operating system using binary arithmetic:1MB = 1024KB,1GB = 1024MB; so there are some differences between display capacity and nominal capacity of flash memory product About capacity: 4GB=approximately 3.5GB-3.7GB 8GB=approximately 7.4GB-7.8GB 16GB=approximately 14GB-15GB 32GB=approximately 28GB-30GB 64GB=approximately 58GB-59GB 128GB=approximately 115GB-120GB 3.How can i track the package? Estimated Delivery Time set by system for expensive shipping method,we can’t change. It’s recommended 15- 60 working days by Ali-Express for this shipping method, but depends on the address,(Only Brazil especially 90days). if you dont extend the time any more,or the package confirm the delivery of automatic. As above reasons,we cant accept this negative feedback!!!! Note : Less than 12 usd, we will deliver it in seller’s shipping method, when it arrives in your country, it takes time for clearance and dispatch, and we promise that if you do not receive it in 60 days, we will refund you full money, please do not worry. we do not accept such dispute or negtive feedback when package is sent just for only a few days. thanks so much for your kindly understanding.