LEASE BE CAREFUL WHENEVER YOU'RE USING A PC AT A PUBLIC PLACE (Like INTERNET CAFES OR ANY OTHER PLACES..ETC).
CHECK THE BACK OF THE PC AND SEE IF THE above shown DEVICE IS THERE.IF SO..DO NOT USE IT!!!!
Be careful especially the people who use the internet in these places to enter their bank accounts online or any other important sites.
After you enter the bank account and leave the PC it will be easy to open your account again as all what you have typed has been saved in the Black device.
Therefore, you should check the PC for any suspicious piece behind it before using the net in public places for important sites.