Smart U-Disk / Smart U-Disk

Smart U-Disk can tell you how much storage space is left.There is micro programme in it so you can set it according to your need.Once remaining storage space is lower than 20%(for eaxmple),the green LED light will turnred ,glittering all the time,so you have to delete some old data if you want to store some new data.What's more,its light only works when it is connected to a computer.