Like Mr. Sjoblom's review says, this device is not strong on longevity. I got mine in March, and it has completely stopped working (tried on multiple computers, various USB ports, the light won't come on and the ports can't identify the device, saying 'This device has malfunctioned').Worked great for a while, but it's toast now. Don't buy it if your computer will stay connected for long periods, it might well burn out.