Features: brand new and high quality 3 Digital I/O extension(D14-D16). Analog sensor extension port: Orange for Signal,Red for Vcc,Black for GND. Directly support Xbee and XBee form factor wifi,Bluetooth-compatible and RF modules. Micro USB instead of A-B USB connector. Notice:The analog sensor port pin mapping on RoMeov2 is different from the old version. Please select Leonardoboard when using IDE. ON/OFF switch to control the system power from extermal motor power. S1-S5 switch replace jump cap. Wide operating input voltage. Specifications: for DC Supply:USB Powered or External 6V~23V for DC for DC Output:5V(2A) / 3.3V for DC Motor driver Continuous Output Current:2A Microcontroller:ATmega32u4 Bootloader: ArduinoLeonardo for the R3 pin mapping Analog Inputs: A0-A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12) PWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output 5 for key inputs for testing Auto sensing/switching external power input Serial Interface (TTL Level & USB) Support Male and Female Pin Header Built-in Xbee socket Integrated sockets for APC220 RF Module and DF-Bluetooth Module Three I2C/TWI Interface Pin Sets(two 90°pin headers) Two way Motor Driver with 2A maximum current One Stepper Motor Drive with 2A maximum current Size:89x84x14mm Package Includes: 1 x DFRobotRomeo V2 All in one Controller with L298P Motor Driver note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.