Safe USB / USB memory stick

These days, As a computer is generalized. Using USB memory stick is on a increase. However, long time work in front of computer, you've forgotten USB memory stick when you leave. So I've invented something that as called ‘Safe USB'. ‘Safe USB‘ has special lid : can insert your finger, hang a key ring safely. If separate this lid in USB memory stick, two parts were linked in invisible line. Lid's line gets loose from USB memory stick. This line protects loss of USB memory stick. Line had been rolled in role of spring structure as can shut naturally do. Because having spring structure, Line is coiled naturally.