The FT232R is a USB to serial UART interface A low-cost way to add USB capability to microcontrollers. Use this to give your own breadboard For USB capability for bootloading or downloading sketches. RXD/TXD transceiver communication indicator Includes over-current protection, using a 500ma self-restoring fuse This board includes a DTR pin needed to auto-reset when downloading to your device. Color: Red USB Power Supply: 3.3V or 5V Size:43*17mm