Feature: Chip: FT232RL; FT232RL chip lead all the signal port, TTL / CMOS level; With RXD / TXD send and receive traffic lights; USB powered, optional 5V or 3.3V interface level (if other level, target voltage can be provided directly on the VCC and GND pins) PCB board size: 16mm * 34mm - See more at: http://www.uctronics.com/ft232rl-ftdi-usb-to-ttl-3-3v-5-5v-mini-usb-adapter-module-for-arduino.html#sthash.2BRjfbSn.dpuf