Mouschi Pro USB3.0 U Disk Flash Drives PD137 Metal Mini Portable USB Stick for Laptop Memory Size:64 GB Brand: mouschi Hardware: USB 3.0 Speed: 3.0 Real fast transfer Capacity: 16GB, 32GB, 64GB, 128GB, 256GB, 512GB Size: 68x16x6mm Weight: 16.4g Material: Zinc Alloy + PC Operating temperature: -20 to +60 Storage humidity: 20 to 85% RH