Various causes: There are very many causes, from congestive heart failure, to lymphedema, to venous insufficiency, blood clots, pregnancy, a various other causes, including serious and not-so-serious causes.
I have a Sony DVP ns55p blu-ray player with a usb port in the front. The player requires that the usb flash device (thumb drive) be formatted in FAT32in order to recognize it.
ATR2100-USB US$79.95. Cardioid Dynamic USB/XLR Microphone. This handheld microphone is designed to take you from the stage to the studio and beyond. It offers two outputs: a USB output for digital recording, and an XLR output that connects with a sound systems conventional microphone input for use in live performance.