Features: 100% brand new and high quality Anti-lost metal shackle can be used with keys, wallets and other portable items, easy to access, and not easy to lose. Durable and scratch-resistant. Rotating plug metal hook U disk metallic luster, and mirror finish. High speed reading of massive data, bring you a feeeling of pleasure. Supports hot plug & play, high speed USB 2.0 port.speeds vary depending on types of file being transferred and computer configuration.. You can use the USB stick to back up your photos, your good memory videos, the music or books you want to listen in your car, the power point presentation or project files you need to use, very convenient for you. Package Includes: 1 X USB Flash Drive Specifications: Read Rate:12-18 Mb/S Write Rate:4-10 Mb/S Interface USB 2.0 Color: Black/Silver/Gold Size: approx: 1.8x1.4cm/0.7x0.55in About capacity: 4GB=approximately 3.6GB-3.8GB 8GB=approximately 7.4GB-7.6GB 16GB=approximately 14.4GB-15.8GB 32GB=approximately 28.5GB-30GB 64GB=approximately 57GB-60GB note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. No external power supply requird. To avoid data loss or mechanical damage, do not turn off the computer's power during transmission. Do not unplug the U disk during use, otherwise data may be lost. After the U disk is used, it is best to eject the U disk safely from the computer, so as to extend the storage life of the U disk.