Great little Pro mini development board. Well built and nice and small development board for DIY projects. Works with Arduino software perfectly and comes with bootloadered.
You will need a usb to serial converter chip/board to program this.
Main Chip: Atmega328P-AU
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
Clock frequency: 16MHz
Dimension: 18mm*33mm approx.