Features: Pro Mini ATMEGA328P 3.3V 8MHz Development Board: Main Chip: Atmega328P-AU. The bootloader is already installed in the board. Flash Memory: 32 KB of which 2 KB used by bootloader. 8MHz clock frequency. USB connection off board. Supports auto-reset. Max 150mA output. Over current protected. Support external power supply 3.3V. Size: 33mm*18mm*6mm. 14 digital input / output port: RX, TX, D2 ~ D13. 8 analog input ports: A0 ~ A7. 1 pair TTL level serial transceiver port: RX / TX. 6 PWM ports: D3, D5, D6, D9, D10, D11. FT232RL FTDI Mini USB to TTL Serial Converter Adapter: Chip: FT232RL, not genuine FTDI chip Support Win95/98/98se/ME/2000/XP/win7 32bit 64bit /Vsita/, Do not Support Win8 Draw out all signal port of FT232RL chip Pin definition: DTR, RXD, TX, VCC, CTS, GND RXD / TXD transceiver communication indicator Support both 3.3V and 5V With over current protection, using 500mA self-restore fuse Pitch: 2.54mm Size: 40 x 18mm (L x W) Interface: Mini USB