Casmart Captain America Memory Stick USB 2.0 Flash Drive - w/ Gift Box (4GB) Real Capacity. Unlike those reprogrammed fake chips on the market, our USB flash drives has passed the H2testw test and is confirmed to have an actual capacity of 4GB High Quality. Use A-class chip, can be erased repeatedly for 100,0000 times Waterproof. You don't need to get worried anymore when you accidentally drop this device into your coffee because it's waterproof OS Support: Windows XP/7/8/8.1, Mac OS X 10.5.0 or later, Linux 2.4 Comes with a gift box. Plug and play. Easy to carry around