Features: brand new and high quality Supports 3V to 5.5V power supply and provides bidirectional data communication This converter can be connected to an Serial pin (0,1) to convert standard TTL to RS232. It allows talk to hundreds of RS232 devices. This converter uses MAX3232-based level shifter for converting TTL (Transistor-Transistor Logic) -level serial to standard RS232 serial. RS232 is widely used in radio modifications,phone flash, for XBOX360 flash, GPS, vehicle detection, DVD flash, hard disk repair set-top box upgrade. It can be used to program STC MCU, STM32 Specifications: Material:PCB Communication chip: MAX3232 Working voltage: 3V-5V Interface: TX RX VCC GND (TTL) D9 connector: Female Size: Approx. 3.2x2.8 for cm/1.26x1.1 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Converter Module