The prism LED illuminates to indicate when it’s in use. This allows you to easily check the status of the data transfer so, you can use it with confidence.

When a removable memory device (512 MB or more) supporting Hi-Speed USB (USB 2.0) is connected to a computer with Windows Vista installed, the Windows ReadyBoost function enables any specified amount of this external memory to be added as the system cache.
This means even without expansion of memory of the computer, the use of USB flash drive can stabilize system performance and improve program switching of active applications.
Micro Vault USM-LX supports Windows ReadyBoost.

The Virtual Expander^*1 is originally designed for Micro Vault to automatically compress/decompress files moved to and from the device. It enables you to virtually store up to 3 times^*2 as much data.

It is easy -- the device is automatically recognized by most computers when you plug it into the USB port. Power will be supplied through USB port, so you do not need an AC adaptor.