XCSOURCE FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Module Arduino Mini Port TE203 Chip: FT232RL RXD/TXD transceiver communication indicator USB power supply, can choose 5V or 3.3V ,set by jumper With over current protection, using 500MA self-restore fuse Pin definition: DTR,RXD,TX,VCC,CTS,GND