This product is widely used in radio modifications , cell phone Flash , XBOX360 Flash detection , GPS , car , DVD Flash , HDD repair , set-top box upgrade . Can be used to download MCU types : STC single - chip microcomputer S32 microcontroller NXP microcontroller Renesas MCU NEC MCU Communications IC : MAX3232 Working voltage : 3.3V-5.5V Interface : T X RX VCC GND Package Include: 5PCS x MAX3232 RS232 to TTL Serial Port Converter Module.