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USB Serial Adapter FTDI Chip RS232 DB-9 920K w/ TX/RX LED, Windows 10, 8, 7

Product Review (submitted on May 29, 2013):
I use it while programming where serial devices are used. The LEDs indicate all the states of data and transfer. The LEDs also let you know if your device is ready and when data is being transferred. For the price you can't beat it.