Can’t believe nobody complains about this in YouTube reviews: from an area behind the “9” key, there is a crackle/hiss sound that plays whenever power is activated, whether or not the device is plugged in. I received two units (one a replacement) and both had this issue. Went to Best Buy and held my ear up to the display model — same problem. Apparently all base models have this hiss and, insanely, nobody mentions it. Granted, you have to be in a quiet room to hear it, but once you do you’ll never stop hearing it. Fatal flaw. Do not buy.