Monster Digital 4GB USB 2.0 High Speed Flash Drive with Twist Cap (USBCO-0004-S) USB 2.0 - 32/28Mb/S Read/Write Available in 64, 32, 16 & 8GB High Speed USB 2.0 up to 17MB/s Available in 16, 8 and 4GB Integrated twist Cover no Cap to lose USB 2.0 - 32 and 28 Mb per Second read & write Limited Lifetime Warranty - Details at www.monsterdigital.com/warranty