Hibeam 4 GB USB 2.0 Flash Drives -(10 -Pack), Black Available capacity 3.7 GB (3877/1024 = 3.7) ,Pack of 10 USB 2.0 interface. reading speed up to 10 MB/sec and writing speed up to 3 MB/sec Blinking led indicator keeps orange on USB FALSH DRIVE lets you know work state Swivel design safeguards the connector against damage and a loop offer simple attachment to a key-chain or lanyard 30 DAYS MONEY BACK GUARANTEE , NO -QUESTION- ASKED