USB stick Doctor, heart, nurse style usb 2.0 USB flash drive pen drive 4GB 8GB 16GB 32GB memory Stick Product information 1.usb capacity : 4GB 8GB 16GB 32GB 64GB 2.Interface type : usb2.0 3.Working temperature : 0~50 4.Wirtten speed : 4MB ~ 8MB/second 5.Usb connection,support hot plug & play 6.Compatible:Win7/Xp/Windows2000/Mac9.0/Wista 7.No need drive/power supply only plug in About real capacity : Because manufacturer use memrry decimal arithemtic: 1MB=1000KB 1G= 1000MB,computer use binary operating :1MB=1024KB 1G=1024MB,So the actual memory usb flash drive is asfollow: 1GB actual capacity = 920MB ~ 990MB 2GB actual capacity = 1.8G ~ 1.9G 4GB actual capacity = 3.7GB ~ 3.8GB 8GB actual capacity = 7.4GB ~ 7.6 GB 16GB actual capacity = 14.5GB ~ 15.0GB 32GB actual capacity = 29.1GB~ 30.5GB 64GB actual capacity = 58.5GB ~ 60.5GB 1 Usb flash drive + 1 x PackageBag