R&D Chip: FT232RL. Draw out all signal port of FT232RL chip. Standard interface, compatible with a variety of official Ardui-no controller 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 Pitch: 2.54mm. Size: 36 x 17.5mm (L x W). Interface: Mini USB