This is a plug and play module based on Max3232 IC to convert RS232 level to TTL level easily. The board has got 2 LEDs which blinks during data receiving and transmitting process respectively.
Max3232 is a faster and pin compatible alternative of Max232. Max3232 also works on broader voltage range than Max232, starting from 3V to 5.5V making it suitable for projects involving either 3.3V or 5V logic.