3.3V 5.5V FT232RL FT232 FTDI USB to TTL Serial Adapter Module for Arduino Mini Port Use FT232RL chip; Draw out all signal port of FT232RL chip; RXD/TXD transceiver communication indicator; USB power supply, can choose 5V or 3.3V ,set by jumper. Each module has been tested Can use for Arduino Pro Min. Shipping Included: 1PCS*FT232RL USB to Serial adapter module USB TO RS232 Max232 for Arduino download