Product description Color: 8GB*50P KOOTION USB Flash Drive Features: 1. Every Piece Tested and Formatted Before Delivery. Available in Black Black/Silver Blue Green Red Orange colors. 3. Available in1GB 2GB 4GB 8GB 16GB capacities. Specifications: Chip: Grade A original brand flash memory chip Interface Type: USB 2.0. Backwards compatible to USB 1.1 Writing speed: 3MB/S-6MB/S Reading speed: 6MB/S-12MB/S Compatibility: Desktop Laptop Mac Tablet Speakers Television Car video system which has USB port Operating System: Windows 98second edition/NT/ME/2000/XP/7/8.1/10 and above /Linux/ Mac OS 10.3 and above Operating Temperatures: 32° to 140°(0° to 60°) Storage Temperatures: -4° to 185° (-20° to 85°) Durability: 50 000 times read and write Package Included: 50 x 8 GB Bulk USB Flash Drives 100% Risk-free Satisfaction Guarantee from the Date of Purchase We offer you 100% after-sale service and risk-free satisfaction guarantee to enhance your confidence to buy the usb flash drives from KOOTION . No question asked.