XIWANG instrument series usb high speed pen drive violin USB3.0 4GB 8GB 16GB 32GB 64GB music memory stick U disk holiday gift Capacity: Flash memory vendors are using decimal arithmetic:1G=1000MB calulated, and the operating system using binary arithmetic:1G=1024MB, So there are some differences between display capacity and nominal capacity of flash memory products. About REAL Capacity: 4GB = approximately 3.6GB-3.8GB 8GB = approximately 7.4GB-7.6GB 16GB = approximately 14GB-15GB 32GB = approximately 28GB-30GB 64GB = approximately 58GB-60GB 128GB = approximately 119GB-120GB Please Google ‘Memory card capacity’ to get more information. If you have any questions, please feel free to contact us. Products Description 1) storage capacity: 2GB/4GB/8GB/16GB/32GB 2) Interface: USB 2.0 3) Environment Temperature: -40°C – +70°C 4) Storage Temperature: -50°C – +80°C 5) USB Service Voltage: 4.5V-5.5V 6) Storage Lifetime: More than 10 years 7) Use A-class chip, can be erased repeatedly for 100,0000 times 8) Operating System: Win98/ME/2000/XP/ Vista/win7/win8 , Mac OS 9.X/Linux2.4 or above 9) USB connection,support Hot plug & Play. 10) Easy to read and read in high speed ,No need drive/power supply only plug in. Warranty 1) All the items has 3 years warranty. 2) If the item is defective use by technical reason,you could sent back to us for New one.Customers are responsible for 2-way shipping charges on any returned items. It may take up to 7 business days to process your return after we receive your product. 3) All items must be returned in their original condition, In order to qualify for a refund or exchange of goods. 4) Our warranty does not extend to any products that are physically damaged or that are not under normal operating conditions as a result of misuse or improper installation. 5) No refund accepted after 30 Days of receipt. 6) Items returned after 7 days of delivery are only eligible for repair. Feedback 1) Your Feedback is really important to us, please take a few seconds to leave great feedback if you are satisfied with our product or service, thank you so much !! 2) We always offer the lowest price for best goods and service to you. 3) Please contact us before leaving neutral or negative feedback.We will try our best to solve the problem and leave you a happy shopping mood here. Thank you! Contact us If there’s any problems or questions about you order, please contact us by Email or TradeManager, we will reply within 24 working hours.